Simple Fire Alarm Circuit

The post discusses a simple fire alarm circuit that you can build and install at home or shop. At the point when there is a fire breakout in the room the temperature increments. This ultra smaller and minimal effort blaze alert faculties fire breakout in light of this. Transistor BC177 (Q1) is utilized as the […]

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Dark Room Timer Circuit

 Working in a darkroom is always fraught with problems. You surely know Murphys Law of. . ., but Let’s not go into that here. Suffice it to say that normal lights cannot be used in a darkroom when photographs are being developed not even if you drop your glasses! The dark room timer circuit here […]

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Recording Level Meter Circuit

The circuit shows a two—stage voltage amplifier driving a recording level meter. The AC signal input is amplified, rectified, and the resultant DC voltage shown on the meter. The circuit can be used with a tape recorder or audio mixer and should be fed from a point early in the pre-amp. Current consumption in a […]

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PWM Solar Charger Circuit

A request for a solar pwm solar battery charger circuit made by one of the user is discussed below, an appropriate circuit design for the same may be seen at the bottom of the article. I have been reading your posts for hours upon hours looking for the exact design or how I can put […]

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Transmitting Electricity Without Wires

 Here’s 2 pictures which shows how to transfer electricity without using wires, one is the fully completed second sec exciter is guess what despite the last 2 series coil sections mistakenly wound in anti clockwise direction unlike the first 2 coils in the series wound in clockwise direction this thing actually works in pulsating the […]

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Signal Injector Circuit

While troubleshooting amplifier and audio related equipment, a signal injector circuit becomes one of the most essential tools, here we learn how to make a signal injector circuit. Here is a two in-one test instrument incorporating a signal injector and a signal tracer. If any audio equipment is not working, an audio signal can be injected at the volume […]

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Police Strobe Light Circuit

When powered this police strobe light circuit, produces the recognizable strobe light illumination that can be seen in police cars. To arrive at the desired effect two pieces of lights were implemented (in our scenario: LEDs), which are activated alternately. Whenever a set is running, the corresponding LED turns on and off three times. Subsequently […]

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Simple Transistor Tester Circuit

The circuit used in making simple Transistor Tester Combo-2 has only one IC. This IC performs the following process as mentioned below: Test Process1: Position the transistor to the three circuit terminals of Circuit 1 (located either below of left of the terminal). Once pointed, the red LED can then identify the PNP transistor base. This […]

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Light Activated Switch Circuit

This light activated switch circuit relay is activated only in the presence of light. It has many applications, it could be used as a photocell and to off the light in a room or turn on the radio when it is dawning, etc. Working of light activated switch The photoresist / LDR whose ohmic value […]

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PIR Motion Sensor Circuit

The post discusses a simple PIR motion sensor circuit shared by one of the interested members of this blog.   This is my smallest, cheapest, foolproof etc. movement detector with dim-switch that works in all conditions. In the drawing “tv” means “or similar”. Enjoy! I have operated the circuit with 2½-9V, but maybe ca 5V […]

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