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Four Tone Siren – Circuit Schematic
Four Tone Siren
The UM3561 contains programmed mask ROM to simulate siren sound. Power consumption of IC is low. It is powered by 3 Volt. One NPN Transistor is used for amplifi...
Onkyo TX2500 mk II – Circuit Schematic
Onkyo TX2500 mk II
I have an Onkyo TX2500 mk II receiver that I`m hoping to fix up for a friend, which is not working properly on AM or FM. Tuning to AM gives low.....
Yamaha DX7 memory backup circuit – Circuit Schematic
Yamaha DX7 memory backup circuit
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True Bypass Passive Ring Modulator – Circuit Schematic
True Bypass Passive Ring Modulator
A simple 2 Transformer, 4 Germanium Diode Ring Modulator with a true bypass switching scheme. Includes input for Carrier Wave modulation. Power is only required...
PT2399 Surround Delay Application Circuit – Circuit Schematic
PT2399 Surround Delay Application Circuit
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PT2399 Echo Application Circuit – Circuit Schematic
PT2399 Echo Application Circuit
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CMOS LFSR Vintage Atari Sound Effects Generator – Circuit Schematic
CMOS LFSR Vintage Atari Sound Effects Generator
Schematic for the CMOS Linear Feedback Shift Register Vintage Atari Sound Effects Generator circuit.....
Atari Punk Console – Circuit Schematic
Atari Punk Console
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MIDI Buffer – Circuit Schematic
MIDI Buffer
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Tube Compressor – Circuit Schematic
Tube Compressor
hi i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and.....
Tube preamp tone control – Circuit Schematic
Tube preamp tone control
The +/- 3 dB point for the treble is about 2, 5 KHz, with about 12 dB boost/cut at 10 KHz. Perhaps you should check the wiring (again ) or perhaps componentvalu...
DIY CAT SL1 preamp – Circuit Schematic
DIY CAT SL1 preamp
I build the CAT SL1 preamp with the attached schematic Noted that the gain of this circuit has about 26dB. I noted that the new SL1 have an option.....
valves to replace opamps in cd player – Circuit Schematic
valves to replace opamps in cd player
Originally Posted by ide2003 Hi intensate, I`ve been in your shoes before. If you want no op-amp all together I highly recommends you to have ECDesign`.....
Citation I and IV phono schematic query – Circuit Schematic
Citation I and IV phono schematic query
Part of the difficulty is that multiple caps/resistors are in the circuit in RIAA. This is based on the Harman-Kardon schematic: I don`t have the Cit IV info ha...
Fully Parametric Tube EQ (with gyrators) – Circuit Schematic
Fully Parametric Tube EQ (with gyrators)
A fully parametric tube EQ and my best bet seems to be `merging` these two schematics into one so that i can get a tube-based gyrator section (with adjustable Q...
Tube Parametric EQ – Circuit Schematic
Tube Parametric EQ
Hi, I`ve been looking to add a simple 3 band parametric EQ to a tube bass preamp. My initial idea of making a simple OpAmp based EQ isn`t going to fly .....
Hammond organ circuit – Circuit Schematic
Hammond organ circuit
I could use some help analysing a circuit. Specifically the frequency cut-off between the bass and treble channels. Is it 500Hz, 1KHz or 5Khz. I`m.....
12AX7/12BH7 Hammond Tube Preamp Project – Circuit Schematic
12AX7/12BH7 Hammond Tube Preamp Project
Build a preamp that I want to use to take a 1/4" keyboard line level signal and drive a Leslie 147 amplifier with it. I want to build the preamp using a 12AX7 a...
Hammond C2 Organ preamp – Circuit Schematic
Hammond C2 Organ preamp
So there I was, ripping out a solo during a practice on my ""new"" Hammond C2 organ and the sound falls away and gets soft to the point of no.....
Electric Guitar Pickup SPICE Model (w/Sig. Gen.) – Circuit Schematic
Electric Guitar Pickup SPICE Model (w/Sig. Gen.)
I have designed a simple Electric Guitar SPICE Subcircuit that includes a Signal Generator 440Hz Sine Wave Output at 100mv. The Parameter ""440&quo.....