This circuit converts BCD inputs to analog voltages. The operational amplifier must be powered according to the desired output voltage range. The circuit is from documentation from the 90s.
This half-wave regenerative control was found in an old RCA manual. The circuit can be designed...
I found this circuit in a documentation about thyristors from the 70s. The circuit uses a diac...
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...