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Solar Charger Monitor circuit 18 Apr 2013 | 07:18 am
This add on circuit can be attached to the solar charger to see whether the battery is charging or not. It lights a Red LED to indicate that the battery is not accepting charge. It gives a warning ind...
Solar based Multipurpose Charger circuit 18 Apr 2013 | 07:07 am
Here is an ideal solution to harvest Solar energy for charging purpose. This charger can replenish almost all types of batteries including Mobile phone battery. It uses a Solar Module to convert light...
Phase-shift oscillator 17 Apr 2013 | 08:12 am
Circuit uses a simple RC network to produce an exceptionally shrill tone from a miniature speaker. With the parts values shown, the circuit oscillates at a frequency of 3 kHz and drives a miniature 2W...
Portable-rf-burst-generator 17 Apr 2013 | 08:10 am
The circuit generates low-level rf bursts having frequencies as high as 10 MHz, thus permitting field testing of high frequency receivers. A jumper-selectable binary fraction (liz to `1256 of the Y1 c...
Rain warning beeper 17 Apr 2013 | 08:03 am
One small spot of rain on the sense pad of this bleeper will start this audio warning. It can also be operated by rising water. The circuit has two transistors, with feedback via capacitor Cl, but Trl...
Music synthesizer 17 Apr 2013 | 07:58 am
Three modes of operation are available in the music synthesizer mode play a note, play one of four stored tunes, or record a tune for subsequent replay.
LED Optocoupler circuit 16 Apr 2013 | 08:04 am
This LED Optocoupler circuit uses two ordinary LEDs as the optocoupler element. When a voltage of 2V is fed to the input, LED 2 will generate a voltage that is strong enough to switch on transistor T5...
Triangle Wave Generator circuit 16 Apr 2013 | 08:01 am
This triangle wave generator is made with a trigger Schmitt that converts a triangle wave into a rectangular one used to charge and discharge a capacitor through current sources. The positive current ...
Wireless headphones transmitter circuit schematic 16 Apr 2013 | 07:54 am
This wireless headphones transmitter assures a quality reception over 2 meters. The oscillator frequency is between 1750KHz and 3500KHz and for antenna we use a ferrite bar. IC1 amplifies the audio si...
The Art of Zener Regulation 15 Apr 2013 | 07:21 am
To get precise voltage to a circuit, the simplest and easy way is to use a Zener diode.It uses the reverse breakdown voltage characteristics to maintain a fixed voltage across it The Art of Zener Regu...
