Audio Preamplifier (CB18331E)

This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a Japanese technical documentation from the 1960s.

| Clique na imagem para ampliar |

Solar cell bank (CB20480E)
In the figure we have the way to connect 6 solar cells in order to obtain higher voltage and...
Frequency converter for precision voltage (CB6346E)
This circuit has a maximum frequency of 10 kHz and a linearity better than 0.01%. The circuit is...
5 W Transistor Amplifier (CB10749E)
This circuit was obtained in a 1961 magazine, but it can be easily assembled today, as the...