Night switch (CB8280E)

Found in a 1964 Philips manual, this circuit uses only passive components. The relay is a high voltage sensitive type.

| Clique na imagem para ampliar |

1 to 10 Hz time base (CB7537E)
Found in a magazine from the '90s, this circuit uses an integrated circuit from the era that is...
Sequencer 4013 (CB16064E)
We now present the 4013 in its bistable configuration, in which we use 3 flip-flops (1 and a half...
Regenerative receiver (CB21559E)
This simple receiver was found in a book on transistors from 1954. The coil determines the...