This circuit was found in the July 1994 issue of Electronics Now magazine. The relay can be rated at up to 12 V and 100 mA. The transistor is a general purpose transistor.
We found this circuit in an American documentation from 1969. The circuit works with the polarized...
Using a 4046 PLL we found this circuit in the December 1989 issue of Radio Electronics magazine. The...
Found in an EDN from the 90's this circuit makes use of unusual components today. | Clique na...