This General Electric circuit, in a documentation from the 1960s, allows the use of high resistance resistive sensors with unijunction transistors in a relaxation oscillator.
No information is given about the transformers in this circuit suggested by Motorola in a 1968...
This DC-DC converter was found in old RCA documentation. The circuit operates at 15 kHz. The...
The 709 integrated circuit is not common today. The circuit is from American technical...