This circuit was found in a 90s Popular Electronics. The circuit uses components from that time, intended to receive signals in the range of 150 to 250 kHz.
This 1.5 A circuit is from the LM117 manual. The LM350 can be used for higher current, and the...
This circuit was obtained from a 1966 magazine but can be easily assembled using the 2N2646 as a...
This circuit was found in a 1968 Hughes documentation. The transistors are from that time. The coil...