This shield circuit was suggested by a 90s Popular Electronics. The circuit can use either a triac for a common load or a mechanical relay.
This TTL circuit generates an 18 MHz signal modulated at 300 Hz. Its main use is as a test...
This transformerless low-current power supply circuit was found in the August 1998 issue of...
In the figure we have the way to obtain an operational amplifier with FETs at the input, using a...