Logic level indicator 7400 (CB22407E)

In the figure we have a simple logic level indicator for TTL circuits or powered by 5 V.

Voltage tripler (MSB032)
The presented circuit is used in Power supply to increase the voltage output. The voltage output...
JFET Crystal oscillator III (CB19850E)
The frequency of the LC resonant circuit must be the same as that of the crystal and the JFET...
3-Transistor Amplifier (CB18837E)
This amplifier can be used for public-address or other applications. Three transistors of the time...