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Microphone AGC amplifier – Circuit Schematic
Microphone AGC amplifier
A homebrew 2M transceiver I wanted to use it mobile so I wouldn`t have been able to use a fist mike. I had the bright idea of using one of those cheap personal ...
HF linear amplifier circuit – Circuit Schematic
HF linear amplifier circuit
The PA output Pi section consists of 2 variable Cs (20 - 120pF and a second (home made) 50 - 450pF switched in for the lower bands by a simply modified 12v powe...
Dynaco ST-70 Amplifier – Circuit Schematic
Dynaco ST-70 Amplifier
This classic tube amplifier used to be the best value on the block. Fifteen years ago you could buy one of these for $25. This amp was designed to be inexpensiv...
PREAMP 2012 – Circuit Schematic
PREAMP 2012
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The 2N5109 Amplifiers – Circuit Schematic
The 2N5109 Amplifiers
This diagram comes from the Progressive Communications Receiver that is in most of the latest ARRL Handbooks. This amplifier is used anywhere an IF amplifier is...
Universal Wideband Amp – Circuit Schematic
Universal Wideband Amp
This kit is part of what Diz calls RF Tool Kits, Electronic Building Blocks. He has a number of these kits and more come out every so often. I like to look at w...
W7IUV Amplifier Card – Circuit Schematic
W7IUV Amplifier Card
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Class D Audio Amplifier Matches Class AB With Higher Efficiency – Circuit Schematic
Class D Audio Amplifier Matches Class AB With Higher Efficiency
Class D audio amplifiers are now geared up to replace class AB An integrated high voltage audio driver facilitates the design and construction of a high power.....
Glowing Hybrid Amp – Circuit Schematic
Glowing Hybrid Amp
This odd little amp was something I designed and built for a shootout at the European Triode Festival in 2007. The topic was "White Light" - amplifiers that use...
813 SE triode amps – Circuit Schematic
813 SE triode amps
This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It`s a fairly powerful SE amp that works very well. It...
307A Push-Pull Amp – Circuit Schematic
307A Push-Pull Amp
A single-ended tube headphone amp using the TTVJ Millett 307A. I`ve been breadboarding various SE and PP power amp circuits with the 307A for a good year or mor...
Audio Power Amplifier – Circuit Schematic
Audio Power Amplifier
Measure voltage across the 1k resistor connected to the input stage and Vcc. The DC voltage should be about 2 volt, or 2 mA of current through this resistor. Eg...
FFT audio amplifier design – Circuit Schematic
FFT audio amplifier design
For all of the following tests, we used a high quality signal generator from BlackStar. The PicoScope trace below shows a pure 1 kHz tone from the signal genera...
Cambridge 6580 Rev D Amp Pinout – Circuit Schematic
Cambridge 6580 Rev D Amp Pinout
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Amplifier Stages – Circuit Schematic
Amplifier Stages
The XLR or Cannon-type connector is clearly a better audio connector than a 6. 5mm jack plug and socket, but tradition makes the 6. 5mm socket mandatory despite...
The Orange Amp Mods page – Circuit Schematic
The Orange Amp Mods page
Avoid drilling extra holes and making changes to the chassis and pcbs by all means. This will decrease the value of your amp since you will not be able to resto...
valve amp circuit – Circuit Schematic
valve amp circuit
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tubes williamson – Circuit Schematic
tubes williamson
A discussion of the Williamson Amplifier should be first preceded by an overview of its context in the evolution of the vacuum tube and its application to high ...
The Audionics CC-2 Amplifier – Circuit Schematic
The Audionics CC-2 Amplifier
Although the Audionics CC-2 is named after Cliff Moulton (Audionics` chief engineer) and Charles Wood (Prez of Audionics), as usual in the business world, the p...
The Emperors New Amplifier – Circuit Schematic
The Emperors New Amplifier
The power supply has been simplified- Power transformers and rectifiers have been omitted and some parts have been omitted from the MOSFET voltage regulator cir...