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. Anyone know where I can pick up one of these bad boys?

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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. The load is a unspecified LED emitting visible light.

Instead of just poking at random values and asking what difference they make, stop and actually think about the circuit. Sunday, 30 May Sign up using Facebook. This can work for different values of the resistors R2, R3, Datqsheet, R8.

The base of Q1 needs 2. Hope this helps you out. The lowest voltage drop for such a LED would be 1. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. I would therefore use 3. I would use 1. Each transistor being on keeps the other on. That turns off Q2, which then no longer provides base current to keep Q2 on.

That shorts the base of Q1 to ground, turning it off. Log in to post comments. Looking for Germanium Transistor for Rovio. Changing R2, R3 will make the latch work or not. Now you have to go back and update the min required current sink value for Q1, and ripple thru all the downstream calculations from that as shown above. Added You now say that you want to support a 2sa load current of mA, and that the gain of Q4 is Here is the datasheet URL for this transistor. I added both circuits.

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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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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. When SW1 is pressed for a little while, Q1 is turned on.

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