Electronics > Beginners
Hex Inverter OSC help.
spec:
--- Quote from: elizark on January 10, 2019, 09:16:41 am ---I do plan on wiring a 1/4" jack to run it to a preamp, so would that eliminate the need for anything past the buffer?
--- End quote ---
Could not find an answer to this question of yours: what you say is correct. No audio power amplifier, opamp, or transistors, would be required. But a buffer of some sort would be needed to drive the cable and isolate the synth electronics from the relatively high capacitance and inductance of the cable.
The biggest gotcha in any engineering is frequency stability. It is the source of more problems than all other areas put together (just ask a bridge designer). The buffer would also help prevent oscillations with the cable.
The buffer in this case would almost certainly be just an opamp.
Zero999:
Here's the circuit. It's just a proof off concept, not a complete solution.
Use one Schmitt trigger oscillator and op-amp for each note and mix them using a passive network of resistors and AC coupling capacitors, before the audio amplifier. The op-amps can be the TL074 or whatever. Three hex Schmitt trigger and four quad op-amp ICs will give 12 notes. If the original poster is still interested, I can provide component values and more information.
Navigation
[0] Message Index
[*] Previous page
Go to full version