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Note how the suggested by OP resistor values aren’t that well chosen. Please post datasgeet readings and I’ll try to help you find a replacement. Picked up a dozen just in case from a guy on ebay. I added both circuits. Sunday, 30 May I’ve read that for the most part silicon tranistors are drop in replacements.

Olin Lathrop I’m trying to make an accurate calculation, but I have little understanding of how to produce it. This can work for different values of the resistors R2, R3, R7, R8.

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Each transistor being on keeps the other on. The load is a unspecified LED emitting visible light. I would use 1. The circuit basically consists of 3 sections: Sign up using Email and Password. I’m not a fan of the 5. With R4 of 5. The main job of Q1 is to turn on Q4, so it can power the load.

Hope this helps you out. By Ohm’s law, the maximum R7 value is therefore 3. The purpose of R8 is to make sure Q4 is off when not being explicitly driven. Here is the datasheet URL for this transistor. Soldered it in and voila, works perfectly. When SW1 is pressed for a little while, Q1 is turned on.

Q2, Q4 is 2SA Let’s say now B-E is mV.

(PDF) 2SA1273 Datasheet download

That sounds high for a minimum guaranteed gain, but I’ll 2sa173 your numbers at face value. The LED D1 is used as an example of a load. Home Questions Tags Users Unanswered. Let’s therefore work backwards requiring Q1 to sink 2. Sign up or log in Sign up using Google.

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KTA, BG-ELECTRONICS KTA, A, 2SA

That means a total of at least 1. Figure another mV for Q4 when saturated, leaving 2. Since R3 only needs to react “instantly” on a datasbeet time scale, there is no need to make R3 small. OK I found it.

Looking for Germanium Transistor for Rovio. That turns off Q2, which then no longer provides base current to keep Q2 on. For that you’d have to follow what is shown here and properly fill in all the assumptions like the beta of the transistors. That large current isn’t really needed.