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Topic: Basic Electronics
149 articles
FM transmitter and Dark sensor
A dark sensor can be converted to a simple FM transmitter using the following components. This FM transmitter is very sensitive and it has...
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Dark sensor using BC557
An automatic dark sensor can be made using a PNP transistor(BC557).
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Mode of NE555- Astable
This circuit has been configured in Astable mode. The output pulses are determined by the values of resistors R1, R2 and the timing capacitor C1....
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Sound generator and Musical toy organ
One of the main objectives of LDR Engineering projects is to make students capable of developing their own logic for making devices. Here is an...
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How to use variable resistors
There are 3 pins/terminals on a preset. The maximum resistance that a preset can provide is written on it. If 100K is written on preset, it means...
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Water Level Indicator
We can use the logic of making an automatic light detector to make a simple water level indicator.We just need to remove LDR from the circuit and...
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OR-gate realization
To make an object counter we can use a simple dark detector circuit and a normal calculator. Pole and NO (Normally Open) terminals of a relay have...
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Object counter using LDR and calculator
To make an object counter we can use a simple dark detector circuit and a normal calculator. Pole and NO (Normally Open) terminals of a relay have...
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Multivibrator
A multivibrator is an electronic circuit used to implement a variety of simple two-state systems such as light emitting diodes, timers and flip-flops.
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Remote Tester
Remote tester circuit also resembles the logic of a "dark sensor (using BC557)”. LDR has been replaced with IR sensor TSOP 1738. The circuit works...
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Toggle switch
This 555 timer circuit below toggles the LED when a button is pressed. Pins 2 and 6, the threshold and trigger inputs, are held at 1/2 the supply...
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Mode of NE555- Monostable
Monostable mode of operation Monostable mode of operation of 555 IC can be explained using a simple touch sensitive circuit. Here, timing constant...
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