This circuit is from the Texas Instruments operating amplifier manual. Any operational can be used and the font need not be symmetrical. Rf and Rg determine the gain of the circuit.
This assembly circuit using a small motor as a generator was found in Radio Electroics magazine from...
The operational amplifier taken as an example is uncommon today, but the configuration can be made...
This simple TTL circuit generates sequences of musical notes that can be determined by adjusting R5 and...