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 Tiny visual zero beat indicator

Friday, December 13th, 2013

This circuit is suitable for an indicator to audio signal lower than 3Vp-p. In the circuit, we use a very small parts with only two of the LED display and built-up resistor for current depression. Light-emitting diodes(LED) connected with reverse polarity provide a visual indication of zero-beat frequency. Each Led is on for only half […]


 7805 Current constant for battery charger

Tuesday, December 10th, 2013

I used to suggests a lead-acid batteries charger circuit with current constant, which applied many transistors, can use as well. But several people may be not like them because doesn’t convenient ,too many device It is advantage that we have IC-LM7805- 5-volts 1A positive voltage regulator, can build also the current regulation. It is very […]


 PWM DC motor controller with NE555 and darlington transistors

Friday, December 6th, 2013

This is circuit for dimmer a lamp or controll speed of a DC motor. I used to suggests these circuit by use principle most PWM (PWM Control Speed Motor 12V By TL494) form. But TL494 is not cheap and hard to buy we use NE555 beter very cheap and popular. This circuit have a lot […]


 19W Stereo amplifier circuit using TA7240AP

Monday, December 2nd, 2013

We is used to suggest a small integrated amplifier or the power amplifier with tone control circuit Were combined on the same PCB are 20watt Integrated Amplifier by TDA2005, but them is Mono. Today we see a 19 watts Stereo amplifier circuit using TA7240AP, ideal for small rooms Or use the car because the power […]


 Two tone door buzzer using transistors

Thursday, November 28th, 2013

This is a two tone door buzzer, which is an electronic buzzer types,but them has melodic sound than the general electric bell. Which many people have seen the two tone bell sounds from other electronic journals. But they are circuit that made no who apply them, since Problems three reasons: 1.First, while do not press […]



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