12V/24V lead-acid battery charging circuit

Published:2011/6/23 1:35:00 Author:TaoXi | Keyword: 12V/24V, lead-acid battery, charging circuit

The LM339 simple lead-acid battery charging circuit is as shown in the figure, you can use two 24V lead-acid batteries as the power supply.   (View)

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BG602 charger circuit

Published:2011/6/16 22:14:00 Author:chopper | Keyword: charger circuit

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A3 norm power supply circuit

Published:2011/6/14 8:24:00 Author:chopper | Keyword: power supply

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The electric energy-saving lamp circuit

Published:2011/6/20 0:39:00 Author:Seven | Keyword: energy-saving lamp

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The light touch switch circuit

Published:2011/6/20 0:44:00 Author:Seven | Keyword: switch circuit

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The single key switch circuit (2)

Published:2011/6/20 0:48:00 Author:Seven | Keyword: key switch

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The self-motivated switch stable power supply circuit (1)

Published:2011/6/16 20:28:00 Author:qqtang | Keyword: self-motivated, power supply

The self-motivated switch stable power supply circuit (1) is shown in the following figure:   (View)

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The 70v stable power supply circuit

Published:2011/6/22 2:11:00 Author:Borg | Keyword: stable, power supply

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The 10~65V stable power supply circuit

Published:2011/6/22 1:45:00 Author:Borg | Keyword: stable power supply

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The 120V regulated power supply circuit

Published:2011/6/22 1:40:00 Author:Borg | Keyword: regulated, power supply circuit

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The 175v regulated power supply circuit

Published:2011/6/22 3:12:00 Author:Borg | Keyword: regulated, power supply

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The 0~30v simple steady power supply circuit

Published:2011/6/22 3:58:00 Author:Borg | Keyword: power supply

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The touch switch circuit composed of the phase inverter (2)

Published:2011/6/20 10:52:00 Author:Seven | Keyword: touch switch circuit, phase inverter

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The STK4142 application circuit

Published:2011/6/20 22:09:00 Author:Seven | Keyword: application circuit

The STK4142 application circuit is shown in the above figure.   (View)

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The stable single key electric switch circuit

Published:2011/6/20 0:51:00 Author:Seven | Keyword: single key, switch circuit

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The full-bile rectifier regulated circuit

Published:2011/6/21 1:53:00 Author:Seven | Keyword: full-bile, rectifier

The full-bile rectifier regulated circuit is shown as above.   (View)

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The power supply over current protection circuit of the ring switch

Published:2011/6/16 20:16:00 Author:qqtang | Keyword: power supply, protection circuit

The power supply over current protection circuit of the ring switch is shown in the following circuit:   (View)

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The general power supply loading circuit with the usage of bulbs

Published:2011/6/21 22:28:00 Author:qqtang | Keyword: power supply, bulb

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Operational amplifier anti-blocking circuit

Published:2011/6/13 4:51:00 Author:Christina | Keyword: Operational amplifier, anti-blocking

If we add the large signal or the larger interference to the reverse phase input port of the operational amplifier, the amplifier always can't work normally, and there will be the phenomenon of the signal can not enter the amplifier or the output intermittent, at this time, you must turn off the power supply then turn on again or remove the signal for a period of time, so the amplifier can return to normal. This phenomenon called the blockade or the lockout. This phenomenon is caused by: the transistor of the input stage is saturated, the reverse phase input port and output port lose the nature of the opposite phase, so the circuit changes into the positive feedback.   (View)

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Feedback circuit

Published:2011/6/13 6:50:00 Author:Christina | Keyword: Feedback

In the practical applications, we usually need to add the feedback circuit to the operational amplifier. Because the open-loop gain of the operational amplifier is high, but in the practical applications the open-loop gain of the operational amplifier is not high, so we need to add the negative feedback circuit to form the closed loop to get the corresponding functions. In addition, in the depth feedback conditions, the performance of the operational amplifier will be much better. Same-phase input feedback amplifier circuit The figure shows the same-phase input feedback amplifier circuit. We add the negative feedback resistance Rf from the output port to the reverse phase input, the input voltage is input from the same-phase port. According to the open loop voltage gain expression, we can list: Reverse phase input feedback amplifier circuit: Closed-loop gain: The negative sign of the formula means the phase position of the output voltage and the input voltage is opposite. The formula shows that as long as the AUD is large enough, the closed-loop gain of this amplifier is only decided by the ratio of the resistance Rf and resistance R1, it has nothing to do with other parameters.   (View)

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