This circuit, obtained from a 1965 magazine, can still be assembled using some modern equivalent components. The transistors may be BC558 and the transformer is obtained from a disused transistor radio.
This circuit acts as a VU-meter when connected at the output of any audio amplifier, triggering a...
Molex is using the FFC / FPC Premo-Flex jumpers for inter-board and inter-plate interconnects...
This well-known siren configuration using complementary transistors is from a 1980s documentation. The...