This circuit was obtained in a 1982 English magazine. The purpose of this circuit is to interface signals other than TTL circuits with TTL inputs. The transistor can be a BC548, 2N2222 or any equivalent.
This simple timer is from a 1998 publication. Other operational amplifiers can be used, and the...
Found in an Electronic Design from the 90's, this circuit uses an SCR according to the controlled power....
This circuit decodes signals received in SSB (Single Side Band) obtaining an audio signal for...