This simple timer for incandescent lamps or other non-electronic charges uses a triac as a control element. The triac must be mounted on a heatsink and the time obtained depends on capacitor C2.
This sound or voice relay was found in a Popular Electronics. It includes an amplification stage and can be...
We found this high input impedance, low output impedance amplification stage in the October 1993...
This 12V battery charging circuit automatically shuts off at the end of the charge. The disconnect...