Regenerative circuit for two sensors (CB8266E)

Found in a 1967 American publication, this circuit with feedback for two transistors has a gain of 20 times. Phototransistors are types of the time.

| Clique na imagem para ampliar |

Up to 60 V x 5 A power supply using the 741 II (CB1218E)
This circuit was obtained in an 1975 English publication. It is a voltage regulator circuit for...
Infrared receiver (CB7822E)
In the figure we have an infrared receiver circuit using an operational 741. The circuit is an...
Negative Voltage Regulator (CB15903E)
This circuit is suggested by National Semiconductor and makes use of the negative regulator LM2990...