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You now say that you want to support a final load current of mA, and that the gain of Q4 is Note how the suggested by OP resistor values aren’t that well chosen.

Sunday, 30 May Home Questions Tags Users Unanswered. But then you’re near the edge of what this PNP can do. Content is read only for historical purposes. 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.

2SA Datasheet, Equivalent, Cross Reference Search. Transistor Catalog

That large current isn’t really needed. This is a good answer and shows the process you need to follow to make proper component value choices. The circuits very likely will work but I would not say either circuit in the question is “well designed” or very “robust”. When SW2 is pressed, it turns on Q3. Sign up or log in Sign up using Google. First, let’s see how much current Q1 needs to sink when on.


The purpose of R8 adtasheet to make sure Q4 is off when not being explicitly driven. About Us Advertise Contact Us.

I am assuming that there should be another one on the circuit board. Also from what I’ve read, Ge transistors are prone to eairly demise.

Something in the 2. I’m not a fan of the 5. Instead of just poking at random values and asking what difference they make, stop and actually think about the circuit. Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. Looking for Germanium Transistor for Rovio. Let’s therefore work backwards requiring Q1 to sink 2.

Figure another mV for Q4 when saturated, leaving 2. Anyone know where I can pick up one of these bad boys? The minimum R7 current is now 1. Picked up a dozen just in case from a guy on ebay.

Let’s say we used 2. Each transistor being on keeps the other on. Q2, Q4 is 2SA The LED D1 is used as an example of a load. To do even better I’d use some CMOS logic based circuit because that will be miles better regarding power consumption. That’s the main current that Q1 needs to be able to sink when on. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

For Q4 I think it depends on the load, how much current the load needs.


(PDF) 2SA1273 Datasheet download

Hope this helps you out. The circuit basically consists of 3 sections: OK 2sx1273 found it. This can work for different values of the resistors R2, R3, R7, R8.

Let’s say now B-E is mV. 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. 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.

Log in to post comments. The lowest voltage drop for such a LED would be 1. I think that for both sets of resistor values the latch will work. You can get them from Newark at this link: The load is a unspecified LED emitting visible light.

The main job of Q1 is to turn on Q4, so it can power the load. Sign up using Email and Password. I would therefore use 3. Q1 and Q2 are arranged with positive feedback so that they have two stable operating points.

Soldered it in and voila, works perfectly. For that you’d have to follow what is shown here and properly fill in all the assumptions 2aa1273 the beta of the transistors. That turns off Q2, which then no longer provides base dataxheet to keep Q2 on.