Tag Archives: Power Control

Separate ON-OFF Touch Switch Circuit

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Providing a touch switch can be a cool way to make your circuit looks sophisticated. Moreover, providing separate touch pad for “on” and “off” function improve the safety, since touching one function doesn’t trigger opposite action to what we expect even at wrong assumption about current state. Here is the… Read more »

Auto-Off Power Source

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This is a Auto-Off Power Source circuit. This circuit is used to turn off the power source automatically. This circuit uses the MAX931 that has key features such as high current output, an internal reference, 2.5µA supply current, and hysteresis. This circuit requires only 3.5uA quiescent current to provide voltage… Read more »

Closed-Loop Automatic Power Control for RF Applications

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This is a circuit of Closed-Loop Automatic Power Control for RF Applications. The circuit uses a log detector (AD8318) and a VGA (ADL5330). This circuit has a high temperature stability because of the high temperature stability of the AD8318. The AD8318 also ensures the same level of temperature stability at… Read more »

Solar-Powered Garden Lamp with Light Sensor

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Below is reverse engineered circuit diagram of yet another commercially produced solar garden lamp. To turn the light on at night, this depends upon a CDS photocell. It allows the battery to charge more efficiently although more complex than the circuits. Read more original source: http://members.shaw.ca/novotill/SolarGardenLight/index.htm

SCR And Triac Triggering Circuit With A Positive Power Supply

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The control-circuit output current has to be amplified when the gate current required to trigger the device is higher than the control-circuit output current capability. For example, A lot of MCUs feature output pins with a current capability around 30 mA today. With IGT, they can switch Triacs safely up… Read more »

Automotive Voltage Regulator with Keep Alive Control

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The LM9070 is a 5V, 3% accurate voltage regulator which have 250mA low-dropout. The regulator has an active low delayed reset output flag feature. This feature can be used to reset microprocessor system on turn-ON and in the event that the regulator output falls out of regulation for any season…. Read more »

SCR Basic Operation

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The diagram below  shows us a simple block construction of an SCR (upper left) and its schematic diagram (upper right).  The lower diagram shows us the operation of a PNPN device can best visualized as a specially coupled pair of transistor. When a proper gate signal is applied to the… Read more »

TRIAC Basic Operation

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Triode for alternating current,TRIAC, is an electronic component that can control power in two direction in an AC circuit. The figure (a) shows the block construction and schematic symbol of TRIAC. The TRIAC is operated like two SCRs in parallel connection in opposite direction like shown in figure (b). Here… Read more »