Found in an American publication from 1968, this circuit generates pulses at a rate of 2,500 per second. The transistor can be replaced by a modern equivalent.
I found this circuit in a 1974 magazine, but it can still be easily assembled because the...
This circuit transmits in the FM band. It is a good range FM transmitter found in a 90's Silicon...
A flash of light directed at the LDR causes the SCR to fire and the motor to be activated in the...