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Why is it so hard to answer this question. (Which transistor to select).

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tooki:
Somehow I doubt the OP is at that point.  :-//

tggzzz:

--- Quote from: chinoy on November 03, 2023, 08:20:11 am ---I dont know why everybody feels they could answer the question better if they had the complete circuit.

--- End quote ---

That seems to be a common point in the threads you start, e.g. the one on measuring voltages with multiple instruments. https://www.eevblog.com/forum/chat/how-do-you-calibrate-your-gear/msg5148885/#msg5148885

You are a beginner who doesn't know what they don't know. Other people have significant experience, and do know what is not in your question.  Hence they ask questions in order to provide better answers.

Listen to the questions, and answer them. That way you will learn something.

Alternatively, if you don't want to provide the necessary information, why ask the question?

Someone:

--- Quote from: chinoy on November 03, 2023, 08:20:11 am ---Ask me a question which you think is complex about the design of a two stroke engine maybe I could give you a simple answer in simple english. That even a newbie could understand. Ive spent the last 20 years of my life answering such questions for my forum members.

Let's narrow it down to TO92 BJT NPN transistors only.
--- End quote ---
Let's narrow it down to cam shafts 320mm long.

A boring parameter that has little to do with the action/function of the device.

chinoy:

--- Quote from: JohanH on November 03, 2023, 09:21:53 am ---
Btw, I remember your forum from way back. I still have an RD350 and H1 500 in the shed that I haven't ridden in years. I used to read lots of 2-stroke literature back then (Jennings, Blair, Bell, Cameron, etc. books I have), even wrote a basic 2-stroke exhaust tuning program. I'm a little disappointed the 2-stroke advancements took so long to make it into production and now electric motors are taking over. But that's off topic...

--- End quote ---
Small world eh.
The old forum grew too big when we crossed 100,000 members. I could not afford the bills. Esp as we refused to run adds or accept sponsors. So I moved it to Face Book. Time permitting I hope to fire up the old forum one last time. But there is a lot of work involved as the forum s/w version is now beyond the point of easy migration.

They have been saying that two strokes are dead for the past 20 years. Yet based on our sales for our products even I am surprised at how well they are doing. I have a RZ350 and a few RDs that I need to rebuild and start riding again. After my 2nd heart attack Drs said to avoid 2 wheelers. But I plan to freshen up the engines with some fresh oil seals and ride them.

Sorry for going OT.

And thanks for all the helpful answers.
What I have learned since I made this post is that
1. You cant measure Noise and THD on a cheap scope with FFT. Much better to use software.
2, In order to use software I need to get an external USB sound card.

As a kid in 79 I blew my dads pride and joy an Akai amp. He flew jets for the IAF and the best of the best instructors were sent to Iraq to train their pilots on Mig 21s. It was during this tenure that he purchased his amp. So its not like he could go out and get another or fix it. Im trying to recreate that transistor sound as an AMP for him.

I have built a few quasi complementary amps, som chip amps LM3886 / TDA7294 / STK and then the P3A and vasp class A/B.
In most cases I buy just the PCB from a local vendor and do the rest following their schematic. And recommended mods.
I have been in audio for all of 1`year. So forgive the noob questions. And Id be happy to answer any engine related posts in the Everything else section if I can.  (Mods can delete this post if its TMI. ).

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