Schematic Diagrams

Useful schematic and wiring diagrams. ✔ ✔ Enjoy electronic circuits, let your idea comes to hardware


Multitone Siren

This multi-tone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catching than a single-tone siren. The circuit is built around popular CMOS oscillator-cum-divider IC 4060 and small audio amplifier LM386. IC 4060 is used as the mult-itone generator. A 100µH inductor is used at […]

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Surf Sound Synthesizer

Many people who live close to the ocean have the benefit of being lulled to sleep by the sound of the surf. This circuit may provide a similar benefit to all those poor unfortunates who don’t live near the seaside but who do have the small consolation that they don’t have to worry about rust […]

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Circuit Project: Small Audio Amplifiers Using LM386 and NE5534

Many electronic projects require the use of a small audio amplifier. Be it a radio transceiver, a digital voice recorder, or an intercom, they all call for an audio amp that is small, cheap, and has enough power to provide adequate loudness to fill a room, without pretending to serve a disco! About one Watt […]

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Aviation Intercom

Before its move offshore, I was lucky enough to be involved in developing the avionics system for the Flightship Ground Effect FS8 craft (see Although officially classed as a boat, it has wings and can travel at 180km/h some three metres above the water. The communications system was adapted from an aircraft unit and […]

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2 watts + 2 watts Stereo Using Three LM386

This is 2 watts + 2 watts Stereo small amplifiers using three LM386 ICs. It is cheap and easy to builds for beginner. A basic of amplifier The most normal power amplifier as Figure 1 that connected to directly a positive of speaker and the negative terminal of speaker to ground terminal of circuit. In […]

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The telephone pickup small amplifiers using LM358

This circuit is the telephone pickup small amplifiers for To expand the voice conversation louder. or intercepted phone call. It use pickup telephone and LM358 op-amp IC as preamplifier and LM386 out to speaker and use 9V battery Low power consumption. The working principle The complete circuit of the The telephone pickup amplifier is shown […]

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LM386 audio amplifier circuit with PCB

This is an audio amplifier that can be used with a small 9 volt Battery Operated,Current use as little as 5 milliamps.And amplification up to 500 mW. Which is sufficient to expand the sound from a sound about or the CD Walk Man out to the small speakers clearly. When entering the power supply 9-volt […]

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LM386 amplifier circuit published a new article with LM386 amp circuits designs. There are 4 LM386 audio amplifier circuit designs, with gains of 20, 50, 200 dB and a bass boost circuit. LM386 is a versatile, small power amplifier designed for use in low voltage consumer applications. The gain is internally set to 20 to keep external […]


1W Stereo Audio Amplifier with LM386N

This is a 1 watt per channel using two LM386N. This circuit belongs to and the kit is available there or at This circuit only need 10mA current with best voltage supply is 6-12VDC. No heatsink required for normal usage. There are only a few external components, the IC  contains most of the […]

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Max 1W / 8 Ohms Amplifier based on LM386 with Input for Guitar

This 1 watt amp is very easy to built in very small dimensions, working with only single 9V battery, and is based on amplifier IC type LM386, its capable to deliver a power for some hundreds milliwatts to 8 ohms load, while consuming only a few mA at rest. Associated with a small FET input […]

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