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  1. jeff kloth

    Need audio preamp/buffer constant current (power) for bussing

    This thread problem has been solved. By adding one resistor, I was able to use the factory matching transformer without loading... thanks jk
  2. jeff kloth

    Need audio preamp/buffer constant current (power) for bussing

    I agree one hundred percent about the virtual ground summing amplifier as described. It cannot work for my implementation though because in the existing Hammond organ keying system to which I am feeding these tones into, the busses must connect to the tone generation points directly. This...
  3. jeff kloth

    Need audio preamp/buffer constant current (power) for bussing

    These are simple, cheap Asian-made ebay boards that can be built into a custom case, etc. Hence, no ducumentation. What may help is we are talking about a l/r output capable enough to drive a set of earbuds to reasonable but not particularly loud volumes. To your point about a preamp--...
  4. jeff kloth

    Need audio preamp/buffer constant current (power) for bussing

    I do not have any useful diagram but will elaborate here: The mp3/wav player is a circuit board that takes 5 volts as power and outputs two channels referenced to ground. There is no circuit schematic available for it but I will assume it is a pic type processor or dedicated mp3 decoder chip...
  5. jeff kloth

    Need audio preamp/buffer constant current (power) for bussing

    I have a project that is driving me insane! The basic idea is multiple Mp3/wav stereo players play their sounds of an organ note/voice. One sound per audio channel. So 5 devices plays 10 tones. Then the idea is to switch (like organ keys) the tones on and off into a "buss" that goes to a...
  6. jeff kloth

    Need cheap buffer for audio device

    Indeed! The mighty Hammond organ like B3, etc. The goal: to remove the heavy tone generator assembly for a portable unit being built from an "organ donor"... In your provided schematic, the 2 "R" divider at the positive input-- one end goes to ground and one to +5, yes? Finally you said...
  7. jeff kloth

    Need cheap buffer for audio device

    The circuit of the "player" output is meant to drive earbud style headphones--so basically an iPod style connection consisting of right/left and common ground. The recording I am playing outputs at around 21mv which is similar to the original wheel pickup outputs. I have played it on one...
  8. jeff kloth

    Need cheap buffer for audio device

    Greetings, This is my first post. I know a fair amount about electronics but am still clunky at times. My project needs help. The project is a musical organ device. The object is to replace a magnetic wheel with pickup per sound or voice with an electronic file player. The original organ...
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