We found this configuration in a 1990 Poptronics. The circuit can be powered by voltages between 6 and 15 V, changing the resistors in series with the LED. The frequency is set at R7.
Found in old American documentation, this circuit makes use of operational amplifiers from the 70s...
This circuit was obtained from a 1997 publication. It is an alarm that has a lock and a bistable...
The above project is an H –H bridge drive circuit and can be used to drive DC motors and in the...