This circuit takes benefit of the voltage drop across bridge rectifier diodes to provide a 5-position variable voltage supply to a DC fan or other small DC motor. It is not as environment friendly as a change-mode circuit but it has the advantages of simplicity and no swaping hash. The 4 full-wave bridges are linked so that every has two pairs of sequence diodes in parallel, giving a voltage...
Wednesday, 31 July 2013
Tuesday, 30 July 2013
This circuit named ultrasonic radar, where this circuit can in applying at security system house and or other security and safety system. in principle this circuit consisted of transmitter and receiver which transmitter and receiver can work with the same frequency, if both having different frequency hence this circuit cannot work. For circuit transmitter is given in symbol T, which frequency yielded...
Monday, 29 July 2013
In this article we discuss an interesting circuit which can be used for controlling our mains AC line fluctuations and for producing very accurate stabilized voltage outputs for our domestic electrical appliances.More innovative circuits HERE.The circuit concept is rather very simple. It uses discrete op amps wired up as comparators to sense the voltage levels.As can be seen...
Thursday, 25 July 2013
An audio signal applied to VI is passed through the operational amplifier 741, U2. After being amplified, the output signal V2 is sampled and applied to a negative voltage doubler / rectifier circuit composed of diodes CRI and CR2, with the capacitor C1. The resulting negative voltage is used as a control voltage which is applied to the door] 2N5485 FET Q1. Capacitor C2 and resistor R2 form a...
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