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RAMCO Theremin Circuit Schematic 1954 – Circuit Schematic
RAMCO Theremin Circuit Schematic 1954
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MIDI circuit board schematic – Circuit Schematic
MIDI circuit board schematic
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Microphone Amplifier / Modulator for 7 MHz SSB Transceiver – Circuit Schematic
Microphone Amplifier / Modulator for 7 MHz SSB Transceiver
Microphone amplifier consists of LM324 and two transistors. LM324 is available in 14 pin DIP. I brought it for Rs: 6/-. It contains four identical operational a...
Feeding CB and Ham radio audio into the aux circuit – Circuit Schematic
Feeding CB and Ham radio audio into the aux circuit
You`ll feed the audio from each radio into the ipod audio output, and vice versa. which changes the impedance and affects the sound levels (along with possibly ...
A potentially novel pre-amp for electret mic capsules which have their internal FETs Drain and Source connections available separately – Circuit Schematic
A potentially novel pre-amp for electret mic capsules which have their internal FETs Drain and Source connections available separately
This circuit might also be of interest to people making pre-amps for electret and externally polarized condenser microphones which have no internal FET. (If a s...
AV mod for Famicom(covered most revisions) – Circuit Schematic
AV mod for Famicom(covered most revisions)
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10 STEP SEQUENCER – Circuit Schematic
10 STEP SEQUENCER
This analog sequencer was designed with the idea of cooperative play in mind. It can be used as a standalone instrument, or linked together with other sequencer...
filters – Circuit Schematic
filters
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High Quality Intercom – Circuit Schematic
High Quality Intercom
This circuit consists of two identical intercom units. Each unit contains a power supply, microphone preamplifier, audio amplifier and a Push To Talk (PTT) rela...
Tone Control Circuit – Circuit Schematic
Tone Control Circuit
The first BC109C transistor (left hand side) is acting as a buffer. It provides the circuit with a high input impedance, around 250k has a voltage gain of sligh...
3 Band Graphic Equalizer – Circuit Schematic
3 Band Graphic Equalizer
Using a single op-amp this easy to make equalizer offers three ranges, low frequency, mid frequency, and high. With component values shown there is approximatel...
Speaker signal to line level – Circuit Schematic
Speaker signal to line level
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Sound Blaster Microphone Preamplifier – Circuit Schematic
Sound Blaster Microphone Preamplifier
Circuit is based basically on quite well tested my simple microphone preamplifier. I have built one prototype of this circuit and it worked nicely. Soundblaster...
Line level to phono input – Circuit Schematic
Line level to phono input
The circuit does two functions: signal level attenuation and inverse RIAA filtering. The signal attenuation is needed to convert the 500 mV signal to 2. 5 mV si...
microphone powering – Circuit Schematic
microphone powering
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Simple mixer – Circuit Schematic
Simple mixer
I designed this circuit for one friend of mine to be used as a small portable DJ mixer. The circuit is an audio mixer circuit so simple as it can be. There are ...
Audio amplifier output relay delay – Circuit Schematic
Audio amplifier output relay delay
This is a simple circuit which I built to one of my audio amplifier projects to control the speaker output relay. The purpose of this circuit is to control the ...
LA4555 Audio Amplifier – Circuit Schematic
LA4555 Audio Amplifier
LA4555 Audio Amplifier Stereo circuit  and mono circuit are given in schematic .LA 4555 is basically a stereo amplifier with 2.3 watts into 4 ohms speakers at ...
Door Phone circuit – Circuit Schematic
Door Phone circuit
Door Phone , LM 386 is just right for a door phone application. It is very useful application in the present urban households. One condenser microphone and a sp...
Balanced Low Noise Microphone Preamp – Circuit Schematic
Balanced Low Noise Microphone Preamp
This simple design has very low noise, close to the theoretical minimum, high hum rejection and variable gain with a single rotary pot. It is similar to that us...