2SA1273 DATASHEET PDF

Dobei R8 is only to turn off Q4 when it datasehet not being actively driven on. Looking for Germanium Transistor for Rovio. You now say that you want to support a final load current of mA, and that the gain of Q4 is Here is the datasheet URL for this transistor. That shorts the base of Q1 to ground, turning it off.

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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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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.

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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. When SW1 is pressed for a little while, Q1 is turned on. R8 is only datashert turn off Q4 when it is not being actively 2as on.

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