This small low current inverter operates at 20 kHz frequency. We found it in documentation from the 1980s. The integrated circuit is from that time.
We found this shield circuit in a 1991 technical documentation. The phototransistor can be...
The RF oscillator in the figure provides signals in the range of 7 to 100 MHz, using an overtone...
This transistor gain test was published in Radio Electronics magazine in July 1959. The...