Rocket Altimeter (CB25357E)

Today we have more compact solutions. This is from a Radio Electronics magazine from October 1990. It uses the technology of the time.

| Clique na imagem para ampliar |

Headlight indicator 555 (CB9118E)
This circuit warns when the headlight bulb is on. We found it in a Popular Electronics from the...
Variable Active Cycle 4093 (CB15916E)
The oscillator shown in the figure keeps its frequency constant in an active cycle adjustment...
Two-Transistor MW Receiver (CB23975E)
This circuit was found in an Argentine publication from the 1970s. The circuit can be assembled with...