Interface shield (CB7260E)

This circuit with TTL output was found in a 1968 EEE. The transistor can be of general use. The tunnel diode is an uncommon component today.

| Clique na imagem para ampliar |

Active Antenna (CB16519E)
This booster for listening to signals in the range from medium waves to 30 MHz was found in a 1998...
Simple Touch Switch (CB15424E)
In the figure we show our first circuit that consists of a simple touch switch capable of driving a...
Experimental TTL Transmitter (CB15628E)
Using a 7400 we have a short-wave transmitter from 4 to 9 MHz, shown in the figure. The coil...