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Ham Radio Circuit Audio Filter – Circuit Schematic
Ham Radio Circuit Audio Filter
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Effects circuit – Circuit Schematic
Effects circuit
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ampeg scrambler board – Circuit Schematic
ampeg scrambler board
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Valve phono preamp build – Circuit Schematic
Valve phono preamp build
A stereo valve phono pre built for me by a techie mate. He has the power transformer and all components needed besides the valves which he advised me to source ...
Stylophone schematic Electronic marvel from years ago – Circuit Schematic
Stylophone schematic Electronic marvel from years ago
I recently uncovered this schematic, that seems to be authentic and does not feature the 555 timer. Additionally if you check out the picture of Brian Davis on ...
Retronome A Versatile Analog Drum Machine for My Hammond Organ – Circuit Schematic
Retronome A Versatile Analog Drum Machine for My Hammond Organ
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DIY Intercom Design Thread 4 – Circuit Schematic
DIY Intercom Design Thread 4
Nothing wrong at all with that setup IMO. I`ve an (older) Peltor FMT15 amp in my Golf. Works awesome for 2 Peltor headsets. The issue is mixing Peltor & Terraph...
SOWTER VINTAGE AUDIO TRANSFORMERS – Circuit Schematic
SOWTER VINTAGE AUDIO TRANSFORMERS
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Audio Stereo Amplifer – Circuit Schematic
Audio Stereo Amplifer
This setup is quite messy in terms of wires, so I`ve decided to remove both from their respective housings and place them in a nice, custom-built box. Right, so...
Remote-controlled preamplifier – Circuit Schematic
Remote-controlled preamplifier
This is a distillation of my " design notes ", with more practical details as I move along with the construction, and (in due course) some pictures. Right at th...
The Magic Eye Wink – Circuit Schematic
The Magic Eye Wink
A tube commonly used as a tuning indicator in old radios. I had to try them out in my amps. So I plopped together a quick video to see the dramatic and cool vis...
Adding a Mono Mic or Tape Level Output to the 302 – Circuit Schematic
Adding a Mono Mic or Tape Level Output to the 302
The addition of a mono mic-level output to the 302 is a useful addition for feeding transcription recorders, Comtek  transmitters, and other inputs. The diagr...
Transmit Audio Cable – Circuit Schematic
Transmit Audio Cable
The TX audio cable can be a little more complicated then the RX audio cable. Normally, the TX audio cable must have a circuit to attenuate the voltage leaving t...
Sonifex CM-CU21 Commentatator Unit – Circuit Schematic
Sonifex CM-CU21 Commentatator Unit
The CM-CU21 is a high quality, portable Commentator Unit. Its sturdy construction and flexibility of features make it suitable for use in a wide variety of envi...
Sonifex CM-CU1 Commentatator Unit – Circuit Schematic
Sonifex CM-CU1 Commentatator Unit
It provides a fully featured commentator position and a line-level input. The unit has an individual commentator output, with an additional output providing a m...
22 Different Brands of 12AX7 Tubes Tested Against Each Other – Circuit Schematic
22 Different Brands of 12AX7 Tubes Tested Against Each Other
Today, it is by far the most common preamp tube used for electric guitar amplification and there is an almost overwhelming supply of current production options ...
Simple Schematic for VCA mixer – Circuit Schematic
Simple Schematic for VCA mixer
How a cutt of a fader is differnet form a transform What does skratch tricks have to do with the fader function The cut on a fader is completely different from ...
Transistorized Auditory Gimmick – Circuit Schematic
Transistorized Auditory Gimmick
(This circuit first appeared in "The Braille Technical Press", edited by Robert W. Gunderson, in 1955. Gunderson, W2JIO, designed this "gimmick" to read transmi...
Ears and Speakers Protector – Circuit Schematic
Ears and Speakers Protector
Sometimes the output volume of amplifier is too high and hurts our ears. As well as hurting your ears, this incident could damage your loudspeaker. The circuit....
Fuzz Box Distortion Pedal Guitar Effect – Circuit Schematic
Fuzz Box Distortion Pedal Guitar Effect
This guitar effect circuit uses a simple high gain amplification, followed by a symmetric clipping using parallel diodes clipper. The gain of the 741 op-amp.....