This circuit was obtained from an American 80's documentation. The balanced mixer can be shown in CB4234. The circuit is for controlling RF signals in a modulation system.
This circuit controls a heating element using a triac. Triac must be fitted with a heat sink. We...
Found in a 90s Popular Electronics, this circuit is intended for amplifying analog video signals....
We found this circuit in a 1977 technical documentation. The FET can be the BF245 and the bipolar...