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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Let’s therefore work backwards requiring Q1 to sink 2. I think that for both sets of resistor values the latch will work.

Looking for Germanium Transistor for Rovio. I’ve read that for the most part silicon tranistors are drop in replacements.

2SA datasheet(1/1 Pages) KEC | Silicon PNP Transistor Epitaxial Planar Type(PCT PROCESS)

I thank you for having responded to my question. When Q1 is off, Q2 is off, which then does not try to turn on Q1. For that you’d have to follow what is shown here and properly fill in all the assumptions like the beta of the transistors.

This can work for different values of the 2sa1237 R2, R3, R7, R8. Thanks for the feed back. Note how the suggested by OP resistor values aren’t 22sa1273 well chosen. About Us Advertise Contact Us.


Since you haven’t specified speed, there is no way to say whether 5. Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. You haven’t provided a datasheet for the 2SA, so we’ll 2ssa1273 assume they can be counted on to have a gain of at least Picked up a dozen just in case from a guy on ebay. Sign up using Email and Password.

2SA1273 PDF – PNP Transistor – KEC

Glade it datashwet for ya. I’d round down to the next common value of 2. Something in the 2. The lowest voltage drop for such a LED would be 1. That pulls the top end of R4 which, which turns on Q1.

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2SA NTE Equivalent NTE12 TRANSISTOR PNP SILICON – Wholesale Electronics

I am assuming that there should be another one on the circuit board. Please post the readings and I’ll try to help you find a replacement.


2sq1273 LED D1 is used as an example of a load. 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 would use 1. Also from what I’ve read, Ge transistors are prone to eairly demise. From inspection, we can see that the current to drive Q2 can be much smaller than that.

Figure another mV for Q4 when saturated, leaving 2. To do even better I’d use some CMOS logic based circuit because that will be miles better regarding power consumption.

You now say that you want to support a final load current of mA, and that the gain of Q4 is This pulls the bottom end of R2 low, which datashet on Q2. Soldered it in and voila, works perfectly. Jax edited the first few lines “removed that is” .