This amplifier, whose mounting on a printed circuit board was described in Radio Electronics of October 1960, has 35 W of power. The power supply uses a transformer and a set of 5 tubes.
This simple alarm circuit was found in the May 1990 issue of Radio Electronics magazine. The...
With this circuit, obtained from an American publication for radio amateurs in 1976, it is...
This peak indicator for stereo amplifiers uses a CA3130. The 80's circuit does not need a...