Temperature control (CB10167E)

This circuit controls a direct current heating element. Power transistors must be load dependent. The components support modern equivalents.

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Precision Tone Switch 4046 (CB25256E)
Using a 4046 PLL this circuit recognizes a 1.6 to 1.8 kHz tone by driving an output LED. The...
Sequential Tone Recognizer LM567 (CB12669E)
In the figure we have a circuit in which the second tone recognizer remains disabled until the...
1 kHz low pass filter (CB7579E)
This filter can be implemented with almost any operational. The power suppply must be symmetrical. ...