Sinusoidal peak detector (CB21519E)

This circuit for a frequency of 10 kHz was found in an Electronic Design. It makes use of a tunnel diode. The transistor admits equivalent.

| Clique na imagem para ampliar |

Moving scale DC voltmeter (CB7341E)
This circuit was found in an American publication in 1966. The circuit uses a general-purpose FET that...
Simple Alarm (CB19221E)
This circuit has no lock, but it has a very low consumption feature in the standby condition. We...
FM Local Oscillator (CB4293E)
This is the typical circuit of a local oscillator for a superheterodyne FM receiver. The circuit...