This low frequency divider uses unijunction transistors. The bipolar transistor can be a BC548 and the zener diode Z4XL can be a 12 V zener. The circuit was found in a 1967 publication.
This voice scrambler is used to obtain effects in the 2.5 to 5 kHz range. The circuit is from...
This is the traditional voltage follower configuration with the 741 operational amplifier. The...
This circuit can reduce the voltage of a source by providing regulated adjustable output. The...