This simple neon lamp oscillator produces a 140 Hz, 40 V peak-to-peak signal. The frequency is given by the capacitor that can have its value changed. Note the high supply voltage.
The frequency of a XTAL (up to 1 MHz) can be divided by powers of 2 up to 16,384 using the CMOS IC...
This amplifier has an input impedance of 20 M ohms. We found it in documentation from the 1980s. The...
This circuit for a simple alarm system was suggested in an article in Electronics Now magazine. The...