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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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 What is the difference between the circuits?

That large current isn’t really needed. Jax edited the first few lines “removed that is”. That’s the main current that Q1 needs to be able to sink when 2a1273. Sign up using Facebook.

From inspection, we can see that the current to drive Q2 can be 2sa12273 smaller than that. Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it.

Q2, Q4 is 2SA This pulls the bottom end of R2 low, which turns on Q2. Glade it worked for ya. You can get them from Newark at this link: Note how the suggested by OP resistor values aren’t that well chosen. I am assuming that there should be another one on the circuit board.


For that you’d have to follow what is shown here and properly fill in all the assumptions like the beta of the transistors. 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.

I think that datashedt both sets of resistor values the latch will work. 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.

Olin Lathrop k 30 So now you should be able to see for yourself what a good range of values for the resistors are. But then you’re near the edge of what this PNP can do. That pulls the top end of R4 which, which turns on Q1.

I would therefore use 3.

Looking for Germanium Transistor for Rovio |

Also from what I’ve read, Ge transistors are prone to eairly demise. To do even better I’d use some CMOS logic based circuit because that will be miles better regarding power consumption. 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.


When SW1 is pressed for a little while, Q1 is datashet on. Email Required, but never shown. It’s still difficult for me to understand, but I will learn. The base of Q1 needs 2. Post as a guest Name. I’d round down to the next common value of 2.

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

I added both circuits. Lower values turn it off faster. Content is read only for historical purposes. The load is a unspecified LED emitting visible light.

Looking for Germanium Transistor for Rovio

About Us Advertise Contact Us. Hope this helps you out. Let’s therefore work backwards requiring Q1 to sink 2. I thank you for having responded to my question. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. With R4 of 5. The main job of Q1 is daatsheet turn on Q4, so it can power the load.

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