Circuit for telephone (CB9408E)

This old common analog telephone circuit was found in 1967 American documentation. The circuit uses only passive components.

| Clique na imagem para ampliar |

Superheteredyne MW Receiver (CB962E)
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...
Darkness Monitor (CB21019E)
Found in Popular Electronics this circuit triggers an SCR and lights an LED when the location of...
International oscillator (CB9646E)
This OF-1 LO oscillator was found in a 1980s American documentation. The transistor can be any...