| The "operational" amplifier OPERATIONAL AMPLIFIERS | | 2008-05-08 06:19:42 | | Long before the advent of digital electronic technology, computers were built to electronically perform calculations by employing voltages and currents to represent numerical quantities. This was especially useful for the simulation of physical processes. A variable voltage, for instance, might represent velocity or force in a physical system. Through the use of resistive voltage dividers and voltage amplifiers, the mathematical operations of division and multiplication could be easily performed on these signals. The reactive properties of capacitors and inductors lend themselves well to the simulation of variables related by calculus functions. Remember how the current through a capacitor was a function of the voltage's rate of change, and how that rate of change was designated in calculus as the derivative? Well, if voltage across a capacitor were made to represent the velocity of an object, the current through the capacitor would represent the force required to accelerate or d | | By: Electronics Circuits And VLSI Engineering | | |
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| Building a differential amplifier OPERATIONAL AMPLIFIERS | | 2008-05-08 06:15:15 | | An op-amp with no feedback is already a differential amplifier, amplifying the voltage difference between the two inputs. However, its gain cannot be controlled, and it is generally too high to be of any practical use. So far, our application of negative feedback to op-amps has resulting in the practical loss of one of the inputs, the resulting amplifier only good for amplifying a single voltage signal input. With a little ingenuity, however, we can construct an op-amp circuit maintaining both voltage inputs, yet with a controlled gain set by external resistors. If all the resistor values are equal, this amplifier will have a differential voltage gain of 1. The analysis of this circuit is essentially the same as that of an inverting amplifier, except that the noninverting input (+) of the op-amp is at a voltage equal to a fraction of V2, rather than being connected directly to ground. As would stand to reason, V2 functions as the noninverting input and V1 functions as the inv | | By: Electronics Circuits And VLSI Engineering | | |
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| The instrumentation amplifier OPERATIONAL AMPLIFIERS | | 2008-05-08 06:14:41 | | As suggested before, it is beneficial to be able to adjust the gain of the amplifier circuit without having to change more than one resistor value, as is necessary with the previous design of differential amplifier. The so-called instrumentation builds on the last version of differential amplifier to give us that capability: This intimidating circuit is constructed from a buffered differential amplifier stage with three new resistors linking the two buffer circuits together. Consider all resistors to be of equal value except for Rgain. The negative feedback of the upper-left op-amp causes the voltage at point 1 (top of Rgain) to be equal to V1. Likewise, the voltage at point 2 (bottom of Rgain) is held to a value equal to V2. This establishes a voltage drop across Rgain equal to the voltage difference between V1 and V2. That voltage drop causes a current through Rgain, and since the feedback loops of the two input op-amps draw no current, that same amount of current throug | | By: Electronics Circuits And VLSI Engineering | | |
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| Fi-Hi Novelty Bags with Speakers & Amplifier | | 2008-04-13 14:50:53 | | This is uber cool. I always thought those huge Tape-recorders beholded by hip-hop loose pant guys is so thing of the past. These are amazingly designed bags implanted with speakers and amplifiers to blow the mind of onlookers. They are available in matt and golden finish. It not only looks jazzy but also smart and trendy at the same time. News say that the Fi-Hi presented its novelty bags equipped with speakers and amplifier during CTIA Wireless 2008 recently. | | By: Unique Gift Idea | | |
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| Simple Thermocouple Amplifier by OP07 | | 2008-03-16 22:23:51 | | The OP07 is in a non inverting amplifier so as not load the mV of thermocouple, the zeners are to protect circuit if junction contacts heaters or the earth gets broken. The RC is to filter out 50Hz pick up in thermocouple wires if near heater wiring and also reduces reading jumps when high current [...] | | By: Circuit Project Electronic | | |
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| 50W Amplifier Constructional Project by TDA7294 | | 2008-03-08 00:16:43 | | This electronic amplifier project is based on an IC amplifier module from ST Microelectronics, the TDA7294. It is intended for use as a high quality audio class AB amplifier in hi-fi applications. It has very low noise and distortion, wide bandwidth and good output current capability, enabling it to supply high power into both 4 [...] | | By: Circuit Project Electronic | | |
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| 25W Audio Power Amplifier by LM1875 | | 2008-03-05 09:31:50 | | This audio power amplifier project is based on LM1875 amplifier module from National Semiconductor. It is able to deliver up to 30W of power using an 8 ohm load and dual 30V DC power supplies. It is designed to operate with minimum external components with current limit and thermal shutdown protection features . Other features [...] | | By: Circuit Project Electronic | | |
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| Line 6 Spider III 15 Guitar Combo Amplifier | | 2008-03-03 03:08:00 | | The Line 6 Spider III 15 Guitar Combo Amplifier is a 15 watt solid state guitar amplifier with built-in Amp and effects modeling. It's a good amplifier for a starting guitar player, and makes a great home practice amp for more experienced players. Spider™ III delivers detailed amp models based on some of the greatest guitar sounds ever created. To keep these sounds authentic, we kidnapped some of our favorite artists to dial in each amp model. Now you can rule the stage with the Insane model with its truly massive gain or explore your sensitive side in the studio with the Clean model. It’s all up to you. Features: 4 Essential Amp Models 6 Effects (2 simultaneous) including phaser, Chorus/Flanger, Tremolo, Sweep Echo, Tape Echo, and Reverb 4 User-programmable channels CD/MP3 jack Headphone/Direct Out for practice or recording Custom 8-inch speaker 15 Watts Amp Models:: CleanSelect this Amp Model and adjust the tone controls to get crisp, amazing clean tones, great warm jazz ton | | By: Guitar Buying Guide | | |
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| Vox Amplug - AC30 Compact Headphone Guitar Amplifier | | 2008-03-03 02:47:00 | | The Tone of a Vintage Vox, Right in Your Headphones! The Vox amPlug AC30 headphone guitar amplifier plugs straight into your guitar's output jack! You get the unmistakable vibe of a classic Vox AC30 amp from the amPlug AC30; just plug this micro tonemeister in and hear the chiming sound of the British Invasion in your headphones. Using two gain stages, the amPlug AC30 is able to emulate the vintage vibe of the legendary amp, while giving you the portability and convenience to take it anywhere. Now you can enjoy incredible guitar tone wherever you want with the amPlug AC30 headphone amp!Vox amPlug AC30 Headphone Gutar Amplifier at a Glance: Amazing tone in a tiny package Analog circuitry, tube tone Get great tone anywhere Amazing tone in a tiny package amPlug is a headphone guitar amp that can fit in the palm of your hand. Just plug it into your guitar, put on your headphones, and start enjoying serious guitar tones with amazing presence. You can choose from three types of | | By: Guitar Buying Guide | | |
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| The Class-A 2N3055 Amplifier 20W | | 2008-03-02 23:46:16 | | care must be taken to ensure that R5 and RV2 are adequately rated. The current through these components is slightly greater than the sum of the output transistor base currents. The output transistor base current is the output transistor quiescent collector current (Ic) divided by the current gain (Hfe) of the device. The current through [...] | | By: Circuit Project Electronic | | |
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| A Pure Class A Dynamic Headphone Amplifier | | 2008-03-01 22:24:54 | | A high-current output amplifier for low-impedance dynamic headphones such as the Grados. The amplifier features an new servo biasing circuit which operates entirely outside the audio feedback loop. The author includes a balanced-bridge version of the amp for headphones that are wired in dual-mono as well as instructions for converting a Grado SR80 to dual-mono [...] | | By: Circuit Project Electronic | | |
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| 1.5W VHF Amplifier by MFR313 | | 2008-02-28 21:40:57 | | This project will explain the basic function of a class-C transmitter. I will explain how to dimension a transmitter and the purpose of the different components. I will also explain how you can build a 1.5W PA transmitter. The project will include PCB, components and instructions how to make coils, assembly and testing.
Read More Source:
http://hem.passagen.se/communication/pa313.html
Thank [...] | | By: Circuit Project Electronic | | |
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| 50W Power Amplifier by STK1050 | | 2008-02-28 21:24:07 | | Here is Power Amplifier 50W Circuit,Use IC STK1050. OCL Class AB Amp.
Voltage supply +35V , -35V 2-3A / Ch
Read More Source:
http://www.elektroda.net/audio/uklady/stk.html
Thank you.
Class AB Amplifier, OCL AMP, Power AmplifierShare This | | By: Circuit Project Electronic | | |
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| 9W Power Amplifier by TDA1010 | | 2008-02-28 21:11:32 | | The TDA1010 is a monolithic integrated class-B audio amplifier circuit in a 9-lead single in-line (SIL) plastic package. The device is primarily developed as a 6 W car radio amplifier for use with 4 Wand 2 Wload impedances. The wide supply voltage range and the flexibility of the IC make it an attractive proposition for [...] | | By: Circuit Project Electronic | | |
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| Simple Class A Power Amplifier by IRF530 | | 2008-02-27 21:41:55 | | I was in need of high quality headphones amplifier because of many reasons and decided to build SDS Labs phone amp. This is extremely rewarding project in a sense that it is fully documented, includes PCB, parts list and building notes - so it’s easy to build and then it sounds great. I have used [...] | | By: Circuit Project Electronic | | |
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| Class A Power Amplifier by IRF530N+78L05 | | 2008-02-27 21:37:10 | | This is the best design I have came up so far!
I use two 6×6x4cm heatsinks per channel. Power supply is unregulated (just transformer, diode bridge and capacitors) but I cannot hear anything even when I put my ear within few centimeters of the loudspeaker. Opamp has very good power supply rejection ratio. I’ve tried to [...] | | By: Circuit Project Electronic | | |
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| Mini Power Amplifier 30W by TIP141 TIP146 | | 2008-02-26 22:58:11 | | Many times we needed a small power amplifier, but good quality, made from distinguishable components. The design does not have any innovation. In the power stage exist a pair of transistors Darlington in package TOP3, which can screwing on a heatsink, putting between them and in the heatsink, suitable leaves mica and silicone ointment on [...] | | By: Circuit Project Electronic | | |
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| 56W Audio Power Amplifier with Mute by LM3876 | | 2008-02-26 21:06:09 | | The LM3876 is a good quality component capable of delivering 56W continuously into an 8 ohm load and 100W peak - enough for any dorm! It has a quoted distortion figure of 0.06% at 40W output, and offers good sound quality in a simple design. It has comprehensive output protection circuitry, preventing not only thermal [...] | | By: Circuit Project Electronic | | |
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| Simple LM386 Audio Amplifier | | 2008-02-23 20:43:03 | | This simple amplifier shows the LM386 in a high-gain configuration (A = 200). For a maximum gain of only 20, leave out the 10 uF connected from pin 1 to pin 8. Maximum gains between 20 and 200 may be realized by adding a selected resistor in series with the same 10 uF capacitor. The [...] | | By: Circuit Project Electronic | | |
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| The Zen Headphone Amplifier by IRF610 | | 2008-02-22 23:20:09 | | This circuit to obtain the best sound from my Grado SR-325 headphones. Portability here was not imperative, so the high power consumption of a real class A amp was not a big drawback. I developed this project at the beginning of 2002 and it was first presented at DIYaudio.com in February 2002. Since the intellectual [...] | | By: Circuit Project Electronic | | |
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| Low distortion 30W audio amplifier | | 2008-02-21 20:54:43 | | This is an unusual circuit for an ultra-low distortion power amp. According to my original notes the circuit is dated January 1977 so the circuit is not exactly modern but it is still sufficiently different to be interesting. The circuit was designed and sold as a card by a purveyor of surplus components but, even [...] | | By: Circuit Project Electronic | | |
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| 3W - 5W Class-A Audio Amplifier by BD439 | | 2008-02-16 02:11:34 | | Behaves like a one-valve operated amplifier
Simple circuitry - No cross-over distortion
In the old valve days, most commercial audio amplifiers suited for compact integrated mono or stereo record players used a one-valve amplifier topology. The circuit was usually implemented by means of a multiple type valve, e.g. a triode pentode ECL86.
Common features for those amplifiers were: [...] | | By: Circuit Project Electronic | | |
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| 24 Watt Class A Amplifier by 2N3055 | | 2008-02-14 06:54:17 | | The supply voltage can be between 34V and 46V and the quiescent current should be set to 1.7A measured through R25 (a voltage of 0.75V must be measured over R25 for a quiescent current of just under 1.7A). R23 is a trimmer and must be set to maximum resistance (10kOhm) when powering up. Then the [...] | | By: Circuit Project Electronic | | |
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| 10-14W Class A amplifier by TIP3055 | | 2008-02-14 06:50:03 | | I have built this amplifier and it does sound good. It requires a preamp as it hasn’t got much gain. It requires big heat sinks and a large transformer and a great power supply and careful wiring, but in the end it is extremely simple and it sounds very good. The zener diode rejects any [...] | | By: Circuit Project Electronic | | |
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| 21W Class AB amplifier by TIP41 | | 2008-02-14 06:45:56 | | This is an instrument amplifier for monitoring music when on stage. It provides 21W output power of this little design. Previously I had a decent 10W amplifier (RED Free Circuits), but we blew that one somehow. Now I will put this into the old box. I haven’t built it yet, but the simulations say it [...] | | By: Circuit Project Electronic | | |
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| 10 watt RF amplifier for 18MHz by 2SC1969 | | 2008-02-13 19:55:31 | | This project and your efforts will provide you with a 0.55…3 watt input to easily 10 watt output. The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply. The design is a good balance between output [...] | | By: Circuit Project Electronic | | |
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| Power Amplifier Engineer - Dallas, TX | | 2008-02-05 10:54:00 | | Share on FacebookPOWER AMPLIFIER ENGINEER - DALLAS, TXemail: dennis@worldlink-us.comGlobal Wireless Leader is searching for a Power Amp Engineer to join its team and creatively develop high efficiency RF power amplifier designs and platforms for broadband wireless systems.Key player will be experienced developing power amplifier linearization techniques - this is a critical skill (must have), and will conduct schematic capture and PCB layout of RF power amp and other RF circuits.Additional responsibilities:Construct non-linear models of power circuits and simulate performance using ADS (linear and harmonic balance)Optimize power amplifier bias and matching circuits to meet efficiency and linearity requirementsDevelop and validate power amplifier line-up analysis against requirementsConduct testing and verification of power amplifier ACPR, EVM, and PAEDerive and specify power amplifier and transceiver block performance requirementsQualifications Background in high power (5 to 50) | | By: WirelessJobs.com | | |
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| 200W MOSFET Amplifier Hifi audio powerhouse | | 2008-01-18 04:17:37 | | A compact audio powerhouse ideal for guitar or PA work or for use as a general-purpose subwoofer or hifi amplifier. Many people prefer Mosfets because of their legendary ruggedness. Altronics had a Mosfet amplifier module which produced 200W into a 4 Ohm load and so we decided to take a look it. It turned out [...] | | By: Circuit Project Electronic | | |
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| Power Amplifier OCL 50W by BD250C , BD249C | | 2008-01-18 04:00:26 | | This simple audio power amplifier was originally designed for a circuit board workshop, conducted by the OSU IEEE Student Group. At the workshop, 20 participants each constructed this amplifier, by etching and drilling the single sided circuit board, soldering all components, and attaching a pre-built heatsink assembly with the output transistors. Three workshops were held [...] | | By: Circuit Project Electronic | | |
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| Power Amplifier MOSFET HI-FI 300W by 2SK1058, 2SJ162 | | 2008-01-17 00:46:33 | | The amplifier consists of two completely separate monaural amplifiers each channel has its own power supply, resulting in zero inter-channel cross talk, a common phenomenon in amplifiers sharing the same power supply. In order to obtain the full output power each supply transformer should be rated at 40VAC - 0 - 40VAC at 640VA. Unlike [...] | | By: Circuit Project Electronic | | |
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| Amplifier Class AB Hi-Fi 70W by MJ15022 , MJ15023 | | 2008-01-16 08:28:03 | | This project considers the development of a 70W Hi-Fi Power Amplifier for use as part of a Hi-Fi separates music system. The design is a fairly simple circuit topology, which is easy to understand and the author believes that the finished result sounds very nice indeed. The web posting is developed from an original design [...] | | By: Circuit Project Electronic | | |
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| LM3886 CHIP Amplifier | | 2008-01-03 07:52:14 | | When I fired it up for the first time, I was immediately surprised with how much power was available, the level of detail and the nice bass response. It sounded much better than I was expecting and much better than it should considering the simplicity and low cost. Initially, I thought it sounded a little [...] | | By: Circuit Project Electronic | | |
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| Simple Audio Power Amplifier 60W by K1058, J162 | | 2008-01-03 05:37:29 | | mosfet amplifiers there is no clear distinction between class-B and class-AB. For a bipolar output stage it is common to call a design class-B if the quiescent current, Iq, is adjusted for minimum crossover distortion, and class-AB if the current is increased well above this optimum level so that operation remains in class-A for small [...] | | By: Circuit Project Electronic | | |
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| Mosfet Power Amplifier 120W by K1058,J162 | | 2008-01-03 05:26:21 | | This amplifier evolved from the previous 6 transistor mosfet amplifier. That design was already so good there seemed no reason to look for improvements, but the high open-loop distortion at 20kHz and the resulting triangular ‘error voltage’ extracted suggested that the non-linear mosfet capacitance was responsible for almost all the distortion, and although the closed-loop [...] | | By: Circuit Project Electronic | | |
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| Portable Headphone Amplifier by BC337,BC327 | | 2007-12-30 11:59:17 | | 3V Battery powered
High Performance unit
Parts:
R1_____________10K 1/4W Resistor
R2____________100K 1/4W Resistor
R3_____________68K 1/4W Resistor (see notes)
R4______________1K5 1/4W Resistor
R5______________3K3 1/4W Resistor
R6____________330R 1/4W Resistor
R7______________4K7 1/4W Resistor
R8______________2R2 1/4W Resistor
C1______________1µF 63V Polyester Capacitor
C2____________100µF 25V Electrolytic Capacitor
C3____________470µF 25V Electrolytic Capacitor
Q1____________BC239C 25V 100mA NPN High-gain [...] | | By: Circuit Project Electronic | | |
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| Power Amplifier 60W by TDA7294 | | 2007-12-30 11:48:17 | | The TDA7294 amplifier module is a monolithic integrated circuit. It is intended for use as an audio class AB amplifier in hi-fi applications. It has a wide voltage range and output current capability, enabling it to supply the highest power into both 4 ohm and 8n ohm loads. With the addition of a handful of [...] | | By: Circuit Project Electronic | | |
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| 10W Audio Amplifier with Bass-boost by NE5532 + TIP41 | | 2007-10-27 14:25:00 | | Parts:
P1_________________22K Log.Potentiometer (Dual-gang for stereo)
P2________________100K Log.Potentiometer (Dual-gang for stereo)
R1________________820R 1/4W Resistor
R2,R4,R8____________4K7 1/4W Resistors
R3________________500R 1/2W Trimmer Cermet
R5_________________82K 1/4W Resistor
R6,R7______________47K 1/4W Resistors
R9_________________10R 1/2W Resistor
R10__________________R22 4W Resistor (wirewound)
C1,C8_____________470nF 63V Polyester Capacitor
C2,C5_____________100µF 25V Electrolytic Capacitors
C3,C4_____________470µF 25V [...] | | By: Circuit Project Electronic | | |
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| Quadraphonic Amplifier for computer by LM1877 | | 2007-10-15 13:41:10 | | Description:
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control,audio levels being directly controlled from the sound card itself.
Parts List:
D1-D4: 1N4001 (4)
C1,C20: 1000u CAP (2)
C2,C11: 47u CAP (2)
C3,C5,C7,C8,C12,C14,C16,C17,C21,C22: 0.1u CAP (10)
C4,C6,C13,C15: 10u CAP (4)
C9,C10,C18,C19: 2200u CAP (4)
R1,R4,R9,R12: 1M RESISTOR (4)
R2,R6,R10,R14: [...] | | By: Circuit Project Electronic | | |
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| 50 Watt Amplifier with ICL8063 and 2N3055 | | 2007-09-09 12:37:56 | | This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it [...] | | By: Circuit Project Electronic | | |
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| 100W RMS Amplifier with LF351 | | 2007-09-09 12:31:47 | | The design is pretty much a standard one, and I’m sure there are commercial units out there that are similar. To my knowlwdge, it is not an exact copy of any commercial unit, nor am I aware of any patents on the topology. To experienced builders: I realize that many improvements and refinements can be [...] | | By: Circuit Project Electronic | | |
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| Common Amplifier Myths Guitarists Should Know About | | 2007-06-26 22:07:54 | | GuitarFact.com has an interesting post titled Common Amplifier Myths Guitarists Should Know About . This is a great post that sheds light on two common guitar amplifier myths about wattage vs. volume and Hybrid amps, two areas I don’t really know much about. So check out the post and please post...
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