Plant soil heater (CB7964E)

This circuit was found in a 90’s 303 Circuits. The components are from the period and the heating system depends on the resistive element.

| Clique na imagem para ampliar |

Non-inverting integrators (CB6842E)
Obtained from an Electronic Engineering of the 90s, these circuits can be applied to almost any...
Band Pass Filter I (CB19684E)
This filter, found in an old manual, has characteristics of reduced overvoltage given by the graph...
MW Wireless Microphone (CB4516E)
The microphone of this short-range MW transmitter should be low impedance magnetic (a small...