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.
This small locator transmitter was found in old Radio Shack documentation. The transistor could be a...
This circuit causes the light of a bicolor LED to change when it is turned on. The time of...
This circuit was found in a 1968s European documentation. It is a current regulator using...