Low Power Op-Amp - Audio Amp (5

Low Power Op-Amp - Audio Amp (50 milliwatt) Circuit Description The example below illustrates using an op-amp as an audio amplifier for a simple intercom. A smal[...]

LM317 Optical warning circuit d

Using an LM317 voltage regulator and some electronic components can be made a very simple optical warning. Used in a device it can make a small 12 V bulb to flas[...]

Electronic Security Door Key

Electronic Security Door Key Circuit Description A different circuit of electronic lock very simple, one and does not need a lot of materials in order to it is m[...]

Automatic street light circuit

There have been lot of problems in street lights. Major problem in some places is every evening a person has to come and switch ON the street light and it should[...]

Uninterruptible Power Supply in

Uninterruptible Power Supply in an IC Cymbet Corporation announced the availability of the EnerChip™ CC CBC3105 smart solid state battery. The CBC3105 combines[...]

Crystal Controlled Oscillator C

Crystal Controlled Oscillator Circuit This general purpose signal source serves very well in signal-tracing applications. The output level is variable to more th[...]

Analog Frequency Meter Circuit

Analog Frequency Meter Circuit using NE555 This 1-kHz linear-scale analog frequency meter circuit uses the 555 as a pulse counter. PARTS LISTR14.7kΩR24.7kΩR310[...]

Surf Simulator Circuit Diagram

Surf Simulator Circuit Diagram Circuit Description Do you long for a beach holiday on a tropical island, but you don’t have the necessary wherewithal? We’ve [...]

Touch switch circuit with auto

Using this circuit diagram can be made a simple connection circuit with touch sensor. This circuit allows delayed disconnection of the connected device, meaning [...]

Controlling a relay with a digi

Controlling a relay with a digital logic level. Circuit Description The schematic below illustrates 4 methods of controlling a relay with a digital logic signal.[...]

Audio/Video to UHF TV Signal Co

This is the circuit diagram of audio/video modulator. The circuit will convert an audio and video signal into a UHF TV signal. Its desired to connect a video sig[...]

Switching Solenoid Driver

Electronics Circuits Reference Archive Switching Solenoid Driver Introduction I guess every designer has circuits which are real flashes of inspiration. This is [...]

Headlights Timer

Headlights Timer Pushbutton activated Very simple circuitry Circuit diagram Parts: R1 4K7 1/4W Resistor R2,R3 1K 1/4W Resistors C1 100µF 25V Electrolytic Capaci[...]

Battery car charger using trans

Using this circuit diagram can be made a very simple car charger which delivers a constant current output. Constant current supplied by the battery car charger c[...]

70-260V AC to 180-350V DC volta

Using circuit diagram below can be built a voltage converter, able to convert a 70-260V AC to a 180-350V DC voltage. For this, a rectifier contained in a MC34161[...]

Report: DC/AC Pure Sine Wave In

Here the project report of DC/AC pure sine wave inverter. This report focuses on DC to AC electrical power inverters, which aim to efficiently transform a DC pow[...]

LM2941C voltage regulator power

A very simple voltage regulator, which requires very few electronic components and has a very low voltage drop and may provide a maximum output current of 1 A, a[...]

Coils Tutorial, RF, Toroids, In

Coil/Inductance History: First a bit of history about this remarkable invention of 'electro-magnetism'. Joseph Henry (1797-1878), was one of the many brilliant U[...]