Based on the Countdown with LCD 2x16, we have made this variant of the countdown. The countdown circuit, or the backwards counting we shall describe, shows the visualisation of the backwards counting on four 7 segment displays.
With a simple circuit and a microcontroller pic, 16F873A model, we designed this digital voltmeter in addition to any power source.
It’s quite simple to use, as a normal power supply, the PC power supply when we need 5 or 12 volts, which are the powers given to us by connectors from the power source ATX.
This led clock circuit is quite complicated to assembly, because of the great quantity of connections it has, but the result is quite visible.
On-off sequence of three relays with a push button, microcontroller PIC 12F675.
With this simple tutorial we’ll construct an entrance to the computer to make it usable like an oscilloscope. We shall transform our PC into oscilloscope.
This circuit is made to protect the speakers from the "pump" inconvenience, that is produced in some amplifiers while they are on.
Digital clock with pic 16F84A.
This simple circuit is based on the well-known integrated circuit LM3915.
This circuit is made up of two integrated circuits: an analogue to digital converter (CA3162), and a decoder of seven segments (CA3161).
Current clamp with a microcontroller.
This circuit is used for switching a computer or any other device which start operating by a click, after a blackout (when power is restored).