Process control interface (CB7831E)

This shield was found in a 90’s Popular Electronics. The circuit can be implemented with modern equivalent circuits.

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5W Amplifier with the TDA1037 (CB21889E)
Obtained from the 1976 Siemens integrated circuits manual, this audio amplifier has thermal...
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We found this circuit in a 2005 Linear Technology manual. The resistor is calculated for the...
4-Channel Remote Control Transmitter (CB18604E)
The circuit presented is quite simple, employing tone modulation of the signal. To receive the...