Intermittent Oscillator or Siren (CB18276E)

The basic siren configuration shown in figure 1 activates a piezoelectric transducer and can be used as an alert or warning device.

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Negative Voltage Regulator (CB15903E)
This circuit is suggested by National Semiconductor and makes use of the negative regulator LM2990...
200 W amplifier for the car (CB8961E)
This circuit was found in a 90s Radio Electronics. MOSFETs must have excellent heat sinks and heat and...
Vibrating Wire Oscillator 2 (CB23900E)
An oscillator slightly different from the previous one also appeared in Radio Electronics magazine in...