2SA1273 DATASHEET PDF

Makree Post as a guest Name. The main job of Q1 is to turn on Q4, so it can power the load. Lower values turn it off faster. The RoboCommunity Webiste no longer accepts new users. Thanks for the feed back. Sign up using Email and Password.

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That shorts the base of Q1 to ground, turning it off. I would use 1. I would therefore use 3. The lowest voltage drop for such a LED would be 1.

With R4 of 5. Glade it worked for ya. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Content is read only for historical purposes. Picked up a dozen just in case from a guy on ebay. For Q4 I think it depends on the load, how much current the load needs. That turns off Q2, which then no longer provides base current to keep Q2 on. Hope this helps you out. Soldered it in and voila, works perfectly.

This pulls the bottom end of R2 low, which turns on Q2. This can work for different values of the resistors R2, R3, R7, R8. Suppose I wanted to feed this circuit from a battery then I want the currents to be as low as possible, for that I would completely re-calculate all resistor values to get the optimum values.

I am assuming that there should be another one on the circuit board. So now you should be able to see for yourself what a good range of values for the datssheet are.

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2SA1273 KEC(Korea Electronics), 2SA1273 Datasheet

That shorts the base of Q1 to ground, turning it off. I would use 1. I would therefore use 3. The lowest voltage drop for such a LED would be 1. With R4 of 5.

FORM K2579 PDF

2SA1273 DATASHEET PDF

I would use 1. The base of Q1 needs 2. You now say that you want datqsheet support a final load current of mA, and that the gain of Q4 is Email Required, but never shown. Home Questions Tags Users Unanswered. Figure another mV for Q4 when saturated, leaving 2.

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A1273 KEC, A1273 Datasheet

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2SA1273 DATASHEET PDF

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