This audio mixer was found in an old American documentation. The potentiometers are 1M and the input capacitors are 100 nF. The circuit requires power supply voltages from12 to 18 V.
This is one of many zero crossing detector that can be found in this section. It was found in...
This circuit with zener diodes was found in documentation from the 90s. The zener diodes determine the...
Found in a PE Hobbyst Handbook of 1991, this circuit was originally proposed to time photographic...