LM741 Voice Filter (CB25936E)

This 300 Hz to 3.4 kHz filter was found in the May 1989 Radio Electronics magazine. The circuit requires a symmetrical power supply.

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Rain alarm with the CA3130 (CB21995E)
Using an operational amplifier with FET, this circuit was found in an English documentation from...
Set Reset Flip Flop (CB20675E) Found in a 1968 documentation, this circuit can be applied to any logic. In this case, we have an example for TTL. a href="images/stories/bc/203509352025_002235_0001.gif" target
With the first project we present, a relay is activated in the presence of light. We can use it as...
AC Amplifier CA3080 (CB25132E)
This AC amplifier has a gain of 40 dB. It was found in the May 1988 issue of Radio Electronics magazine....