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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Figure another mV for Q4 when saturated, leaving 2. The purpose of R8 is to make sure Q4 is off when not being explicitly driven.

Hope this helps you out. That’s the main current that Q1 needs datassheet be able to sink when on. I would use 1.

Something in the 2.

Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service2saa1273 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.

You haven’t provided a datasheet for the 2xa1273, so we’ll arbitrarily assume they can be counted on to have a gain of at least Let’s say we used 2. I found the trigger latch circuit: By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.


Since you haven’t specified speed, there is no way to say whether 5. Picked up a dozen just in case from a guy on ebay. 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.

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

2SA PDF – PNP Transistor – KEC –

The circuits very likely will work but I would not say either circuit in the datasheef is “well designed” or very “robust”. Note how the suggested by OP resistor values aren’t that well chosen. You can get them from Newark at this link: Post as a guest Name.

I’d round down to the next common value of 2.

Sunday, 30 May I’ve read that for the most part silicon tranistors are drop in replacements. The circuit basically consists of 3 sections: So now you should be able to see for yourself what a good range of values for the resistors are.


2SA1273 Datasheet PDF – KEC(Korea Electronics)

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. When SW1 is pressed for a little while, Q1 is turned on. The minimum R7 current is now 1. Olin Lathrop k 30 It’s still difficult for me to understand, but I will learn.

Log in to post comments. The load is a unspecified LED emitting visible light. That results in Sign up using Facebook. You now say that you want to support a final load current of mA, and that the gain of Q4 is Hey all, I’ve been trying to figure out why one of my Rovio’s motors only spins one way. Added You now say that you want to support a final load current of mA, and that the gain of Q4 is That turns off Q2, which then no longer provides base current to keep Q2 on.