1 kHz low pass filter (CB7579E)

This filter can be implemented with almost any operational. The power suppply must be symmetrical.

RF Comparator (CB22319E)
This circuit was found in American documentation from the 60's. The transistors are made of...
Divider by 8 (CB20104E)
This divider by 8 is synchronized because it is implemented based on TTL or CMOS logic according to the...
Pulsing LED UJT (CB18891E)
This circuit causes the LED to flash at a frequency determined by the capacitor and resistor...