LM3900 Non-Inverter Comparator (CB14207E)

The circuit given below was found in the National Semiconductor Linear Applications Handbook. The base is an operational transconductance amplifier.

| Clique na imagem para ampliar |

Beat Frequency Indicator (CB4889E)
This TTL circuit for digital signals up to a few dozen megahertz was found in old documentation, but...
CB24842E Variable oscillator LF381 ()
This circuit with an operational amplifier was found in the magazine Radio Electronics of...
Zero Crossing Detector (CB4000E)
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...