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I read someone requesting a simple guitar effects mixer schematic.I can't remember which thread it was on...anyway here it is.This is from"Shavano Music online" where there are some excellent design articles & introduction to opamp circuits.
SUGGESTIONS/IMPROVEMENTS
If the gain is too much,then replace the feedback POT(100K) to either 47K (x4 gain) or 22K (x2 gain= +3dB) fixed resistors.
If you don't need any gain (unity) then change the feedback R to 10K
Replace output resistor with a 10K Log pot & take the output from the center viper leg to the output j.socket.
IC can be either a TL072 or NE5532 (Do not use TL071 or NE5534 as U need to adjust the "Bias" externally.
Use only 1% metal film resistors.
Remember
All signals/phase will be changed by 180'o since this is actually a summing inverter.But buy using the spare opamp section,the signals can be swapped by 180'o again!You can even have a phase switch if you wish.
SUGGESTIONS/IMPROVEMENTS
If the gain is too much,then replace the feedback POT(100K) to either 47K (x4 gain) or 22K (x2 gain= +3dB) fixed resistors.
If you don't need any gain (unity) then change the feedback R to 10K
Replace output resistor with a 10K Log pot & take the output from the center viper leg to the output j.socket.
IC can be either a TL072 or NE5532 (Do not use TL071 or NE5534 as U need to adjust the "Bias" externally.
Use only 1% metal film resistors.
Remember
All signals/phase will be changed by 180'o since this is actually a summing inverter.But buy using the spare opamp section,the signals can be swapped by 180'o again!You can even have a phase switch if you wish.
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