This automatic night light using 555 circuit automatically turns on the lights at the time when there is no daylight.
This circuit is perfect for lighting alone places like the garden, the front door of the house, etc.
This Microphone Mixer using operational amplifiers combines signals from 3 different sources (3 microphones) easily and economically.
This mixer can even work as an amplifier and portable mixer because of its few components.
The transformer transformation ratio or transformer turns ratio (K) is the quotient value obtained by dividing the number of turns of the primary winding (N1) and the number of turns of the secondary winding (N2). Then K = N1/N2
NAND gate using transistors
This NAND gate using transistors circuit simulates the operation of a two or more inputs NAND gate. (There is a diode for each input. D1, D2, …)
This continuity tester using 741 operational amplifier, operates as a differential amplifier.
A good application for this circuit would be to test welds made on a printed circuit board. It could be also used to test continuity of wires, connections, etc.
This clock signal generator using 7400 IC, is an astable circuit which uses the TTL 7400 integrated circuit.
The 7400 IC has four 2 inputs NAND gates (NOT AND). We only use two gates of this integrated circuit.
This semiconductor diode tester circuit using a 741 Integrated Circuit. It can test whether a semiconductor diode is in good condition and also determines its polarity.
With this sound activated flash circuit, you can achieve incredible pictures of the most unexpected moments.
Pictures like a water balloon that just burst and the water still floats in the air, or when an object of any type explodes.
This 12 volt power supply using 7805 circuit is simple and useful. Sometimes we need to get 12 VDC, but we only have 5 or 9 volts regulators (7805, 7809).
This Relaxation oscillator using an UJT transistor circuit serves to generate signals for power control devices such as thyristors, TRIACs
This simple alarm with thermostats circuit can be used on places where we must detect overheating. It uses 3 thermostats, and a one, 2 contact, relay
