Two batteries reflex receiver (T1655E)

This receiver circuit was found in documentation from 1924. The circuit uses two batteries, the high voltage one being 90 V.

| Clique na imagem para ampliar |

Constant Current Source (CB6628E)
This 1 A circuit was found in a Philips documentation from 1966. The transistor is of the time,...
Micro FM Transmitter (CB18590E)
This FM transmitter circuit was found in a Japanese publication in 1975. Equivalent transistors can be...
5 V regulator 741 (CB19113E)
In the figure we have the basic configuration of a 5 V regulator using an operational 741. In this...