DIY HV Variable capacitor

This electronic speed control (ESC) for brushed motors combines the features of two of my earlier...

Most of the power supply failure indicator circuits need a separate power supply for themselves....

The following circuit can be used to detect those annoying piezo whistles that one can get from...

A power MOSFET and a quad exclusive-OR oscillator makes an effective solid-state relay. Figure...

Designed in the fifties, this pre-amp remained in production until 1975. And, it remains fully...

Here is an automatic water tank controller that controls the operation of a water pump through a...

The LTC ®4241 is a Hot Swap controller that allows a board to be safely inserted and removed from...

When deciding how to move the robot through the house, the designers realized that precision...

Is the use of LM324 as a band-pass filter, LB1405 for five-band spectrum display drive display...

The circuit uses 50 BUZ23 field effect transistors connected in parallel, tube blocking voltage...