We present the circuit of the commercial transistor tester Sanwa SC2 sold in Japan in the 1960s. The circuit has several scales and types of test being powered by a 22.5 V battery.
This traditional circuit is from a 1972 RCA technical publication. The circuit can be developed with...
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...
This 1967 Electronics World circuit is suitable for frequencies up to 1 MHz. The setting applies...