2SA Datasheet PDF Download – Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS), 2SA data sheet. 2SA datasheet, 2SA circuit, 2SA data sheet: KEC – Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS),alldatasheet, datasheet. datasheet search, datasheets, Datasheet search site for Electronic Components and Semiconductors, integrated circuits, diodes and other semiconductors.

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With R4 of 5.

2SA1273 PDF – PNP Transistor – KEC

When SW2 is pressed, it turns on Q3. First, let’s see how much current Q1 needs to sink when on. Sunday, 30 May Since R3 only needs to react “instantly” on a human time scale, there is no need to make R3 small. Also from what I’ve read, Ge transistors are prone to eairly demise.

Since you haven’t specified speed, there is no way to say whether 5. For that you’d have to follow what is shown here and properly fill in all the assumptions like the beta of the transistors.

I would use 1.

This can work datsheet different values of the resistors R2, R3, R7, R8. Figure another mV for Q4 when saturated, leaving 2. Each transistor being on keeps the other on. 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. I can’t find a relacement or equivilent.

【2SA KEC】Electronic Components In Stock Suppliers in 【Price】【цена】【Datasheet PDF】USA

For Q4 I think it depends on the load, how much current the load needs. I’m not a fan of the 5. I think that for both sets of resistor values the latch will work. 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 Let’s say we used 2.

R8 is only to turn off Q4 when it is not being actively driven on. Please post the readings and I’ll try to help you find a replacement.

Soldered it in and voila, works perfectly. What is the difference between the circuits? 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.

Looking for Germanium Transistor for Rovio

You can get them from Newark at this link: When Q1 is off, Q2 is off, which then does not try to turn on Q1. Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it.


So now you should be able to see for yourself what a good range of values for the resistors are. Once you understand what each part does, you’ll be able to find acceptable values for them yourself. I’d round down to the next common value of 2. 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.

This pulls the bottom end of R2 low, which turns on Q2. Olin Lathrop k 30 Thanks for the feed back.

Changing R2, R3 will make the latch work or not. I thank you for having responded to my question. Picked up a dozen just in case from a guy on ebay.

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