Lamp failure indicator (CB8384E)

This circuit indicates when a 28 V lamp burns, lighting a neon lamp with higher voltage. The circuit is from 1969 documentation.

| Clique na imagem para ampliar |

2 transistor radio (CB22272E)
We found this circuit in an American documentation from the 60's. The transistors are made of...
Digital Capacimeter (CB4312E)
The accuracy of this circuit depends on adjustments made with capacitors of small tolerances of known...
OR function with Relay (CB19773E)
The figure shows how to implement an OR function with two inputs, using a relay. The relay...