The configuration shown was found in an old Poptronics but can be easily assembled using a common calculator photocell. The relay is according to the supply voltage.
This circuit was found in a 1980s documentation. It decodes by identifying a certain frequency tone...
This TTL generator that can function as a control shield or external clock for microcontrollers was found in...
November 2016 - New LM2904 amps amplifiers consisting of specially designed operational amplifiers for motor...