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Sunday, 30 May That turns off Q2, which then no longer provides base current to keep Q2 on. It’s still difficult for me to understand, but I will learn.

With R4 of 5. 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.

2SA (KEC) – Silicon Pnp Transistor Epitaxial Planar Type(pct Process) | eet

Glade it worked for ya. That’s the main current that Q1 needs to be able to sink when on. So now you should be able to see for yourself what a good range of values for the resistors are.

Thanks for the feed back. Let’s say now B-E is mV. I’m not a fan of the 5. When SW1 is pressed for a little while, Q1 is turned on. Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small.


(PDF) 2SA1273 Datasheet download

The lowest voltage drop for such a LED would be 1. I’d round down to the next common value of 2.

This pulls the bottom end of R2 low, which turns on Q2. For Q4 I think it depends on the load, how much current the load needs. Suppose I wanted to feed this circuit from a battery then I want the currents to be as low as possible, for that Datqsheet would completely re-calculate all resistor values to get the optimum values.

You 2as1273 get them from Newark at this link: You haven’t provided a datasheet for the 2SA, so we’ll arbitrarily assume they can be counted on to have a gain of at least Lower values turn it off faster.

That pulls the top end of R4 which, which turns on Q1.

2SA1273 Datasheet

Post as a guest Name. The load is a unspecified LED emitting visible light. When SW2 is pressed, it turns on Q3.

Also from what I’ve read, Ge transistors are prone to eairly demise. First, let’s see how much current Q1 needs to sink when on. That large current isn’t really needed.

Log in to post comments. Sign up using Email and Password. The minimum R7 current is now 1. The main job of Q1 is to turn on Q4, so it can power the load. Sign up or log in Sign up using Google.


I dstasheet assuming that there should be another one on the circuit board. Q2, Q4 is 2SA Hey all, I’ve been trying to figure out why one of my Rovio’s motors daasheet spins one way.

I would therefore use 3. Soldered it in and voila, works perfectly. Let’s say we used 2. Picked up a dozen just in case from a guy on ebay. 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. From inspection, we can see that the current to drive Q2 can be much smaller than that. I’ve read that for the most part silicon tranistors are drop in replacements. Olin Lathrop k 30 I would use 1.

I think that for both sets of resistor values the latch will work. Figure another mV for Q4 when saturated, leaving 2.

Please post the readings and I’ll try to help you find a replacement. Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. That results in R8 is only to turn off Q4 when it is not being actively driven on. Home 2sa2173 Tags Users Unanswered.