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Instead of just poking at random values and asking what difference they make, stop and actually think about the circuit.

Also from what I’ve read, Ge transistors are prone to eairly demise.

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. Glade it worked for ya. The base of Q1 needs 2. Please post the readings and I’ll try to help you find a replacement. Lower values turn it off faster. The minimum R7 current is now 1. I’d round down to the next common value of 2.

R8 is only to turn off Q4 when it is not being actively driven on. This pulls the bottom end of R2 low, which turns on Q2. The load is a unspecified LED emitting visible light. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

## (PDF) 2SA1273 Datasheet download

Here is the datasheet URL for this transistor. About Us Advertise Contact Us. So now you should be able 2aa1273 see for yourself what a good range of values for the resistors are.

That’s the main current that Q1 needs to be able to sink when on. Changing R2, R3 will make the latch work or not. Added You now say that you want to support a final load current of mA, and that the gain of Q4 is I found the trigger latch circuit: Since you haven’t specified speed, there is no way to say whether 5.

That means a total of at least 1. Post as a guest Name.

### 2SA (KEC) – Silicon Pnp Transistor Epitaxial Planar Type(pct Process)

Log in to post comments. You now say that you want to support a final load current of mA, and that the gain of Q4 is Let’s therefore work backwards requiring Q1 to sink 2. Q2, Q4 is 2SA Sign up using Email and Password. I am assuming that there should be another one on the circuit board. Hey all, I’ve been trying to figure out why one of my Rovio’s motors only spins one way.

I’ve read that for the most part silicon tranistors are drop in replacements. Olin Lathrop k 30 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.

Soldered it in and voila, works perfectly. But then you’re near the edge of what this PNP can do. By Ohm’s law, the maximum R7 value is therefore 3. The RoboCommunity Webiste no longer accepts new users. 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.

Anyone know where I can pick up one of these bad boys? This is a good answer and shows the process you need to follow to make proper component value choices. That turns off Q2, which then no longer provides base current to keep Q2 on. It’s still difficult for me to understand, but I will learn. I’m not a fan of the 5. 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.

Content is read only for historical purposes. Let’s say we used 2. I would use 1. Figure another mV for Q4 when saturated, leaving 2. I added both circuits. When SW2 is pressed, it turns on Q3.