High impedance differential amplifier (CB20641E)

This circuit is from Texas Instruments documentation from the 1980s. The operatinal ones are from the era and the power supply must be symmetrical.

| Clique na imagem para ampliar |

Magnetic field meter (CB7067E)
Found in an EDN from the 80's, this circuit makes use of an operational one of the time. The...
Telephone Dialer (CB5979E)
This circuit is from the 80's, using an integrated of the time. The circuit serves as a reference,...
3 Volt Switched Regulator LM2577 (CB15410E)
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...