Undervoltage alarm (CB8480E)

This circuit sounds when the input voltage drops below the value determined by the zener. The circuit is from a 90s American documentation.

| Clique na imagem para ampliar |

Remote control extender (CB7026E)
We found this circuit in a Popular Electronics from the 80s. This circuit eventually doesn't work with...
Short Wave Preamplifier (CB19145E)
This circuit is interspersed between the external antenna and the short-wave receiver, providing much...
Power stage for oscillators (CB22383E)
We found this circuit in a publication from the 90's. The circuit is used with sinusoidal...