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I’d round down to the next common value of 2. That’s the main current that Q1 needs to be able to sink when on. Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small. Glade it worked for ya.

2SA1273 Datasheet PDF – KEC(Korea Electronics)

Olin Lathrop k 30 So now you should be able to see for yourself what a good range of values for the 2xa1273 are. About Us Advertise Contact S2a1273. Here is the datasheet URL for this transistor. That pulls the top end of R4 which, which turns on Q1. The circuit basically consists of 3 sections: Hey all, I’ve been trying to figure out why one of my Rovio’s motors only spins one way. I would use 1. Sign up or log in Sign up using Google.

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Content is read only for historical purposes. I am assuming that there should be another one on the circuit board. The RoboCommunity Webiste no longer accepts new users. That turns off Q2, which then no longer provides base current to keep Q2 on. Try to find one and pull it out of the circuit and check the pin lay out and measure it’s B to C and B to E.


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 can’t find a relacement or equivilent. Dahasheet transistor being on keeps the other on. Post Your 2ss1273 Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

By Ohm’s law, the maximum R7 value is therefore 3. I think that for both sets of resistor values the latch will work.

2SA NTE Equivalent NTE12 TRANSISTOR PNP SILICON – Wholesale Electronics

The main job of Q1 is to turn on Q4, 2ss1273 it can power the load. 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.

Let’s therefore work backwards requiring Q1 to sink 2. The lowest voltage drop for such a LED would be 1. I would therefore use 3. Email Required, but never shown. Figure another mV for Q4 when saturated, leaving 2. Lower values turn it off faster. Sunday, 30 May datazheet When SW1 is pressed for a little while, Q1 is turned on.


When Q1 is off, Q2 is off, which then does not try to turn on Q1. Q2, Q4 is 2SA Let’s say we used 2.

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Added You now say that 2saa1273 want to support a final load current of mA, and that the gain of Q4 is The load is a unspecified LED emitting visible light. Note how the suggested by OP resistor values aren’t that well chosen. That shorts the base of Q1 to ground, turning it off.

I found the trigger latch circuit: Home Questions Tags Users Unanswered. Log in to post comments. That sounds high for a minimum guaranteed gain, but I’ll take your numbers at face value. The circuits very likely will work but I would not say datasehet circuit in the question is “well designed” or very “robust”.