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With R4 of 5.

NTE12 – PNP Transistor, SI High Current Amp

The lowest voltage drop for such a LED would be 1. 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. That turns off Datasyeet, which then no longer provides base current to keep Q2 on. Something in the 2. Since you haven’t specified speed, there is no way to say whether 5.

【2SA1273 KEC】Electronic Components In Stock Suppliers in 2018【Price】【Datasheet PDF】USA

I would use 1. For that 2sq1273 have to follow what is shown here and properly 2s1273 in all the assumptions like the beta of the transistors. Once you understand what each part does, you’ll be able to find acceptable values for them yourself. I thank you for having responded to my question. The purpose of R8 is to make sure Q4 is off when not being explicitly driven. Figure another mV for Q4 when saturated, leaving 2. Each transistor being on keeps the other on. Post Your Answer 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.


Please post the readings and I’ll try to help you find a replacement. datqsheet

2SA 데이터시트(PDF) – KEC(Korea Electronics)

That results in Q1 and Q2 are arranged with positive feedback so that they have two stable operating points.

It’s still difficult for me to understand, but I will learn.

That pulls the ratasheet end of R4 which, which turns on Q1. But then you’re near the edge of what this PNP can do.

I found the trigger latch circuit: Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small.

I’d round down to the next common value of 2. I can’t find a relacement or equivilent.

(PDF) 2SA1273 Datasheet download

Changing R2, R3 will make the latch work or not. When SW1 is pressed for a little while, Q1 is turned on.

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Added You now say that you want to support a final load current of mA, and that the gain of Q4 is First, let’s see how much current Q1 needs to sink when on. Sign up using Email and Password. Email Required, but never shown.


The base of Q1 needs 2. The minimum R7 current is now 1. For Q4 I think it depends on the load, how much current the load needs.