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 |

Remote control receiver (CB21914E)
The frequency depends on the coil and is not found in the original documentation but should be...
Digital Do Nothing (CB26218E)
This is a device for those who need to show that they know how to use digital electronics but have...
Sinusoidal generator CA3130 (CB21987E)
Using an operational amplifier with FET, this circuit from a 1977 publication can generate...