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.
Using the LM0101 IC this amplifier was found in October 1982 Radio Electronics magazine. The...
This symmetrical power supply uses regulators from the 78xx and 79xx series and can be adapted to supply...
This variable frequency oscillator (VFO or OFV) was obtained in an old Motorola documentation. The integrated...