We found this circuit in the 1964 RCA transistors manual. The transistors used are uncommon today, but they can be used equivalent. The circuit controls the operation of a heating element.
This timer activates a relay after a time interval of up to 15 minutes has elapsed, starting from...
This circuit, which can be used on an optical link, is suggested by the Texas Instruments...
This circuit uses an MW radio tuned to around 540 kHz to detect atmospheric signals, for example, from...