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How to choose this PNP transistor

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TessieSwift

Jul 31, 2021
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Hi, there.
I want to test it out with a circuit. And I have a few questions
upload_2021-8-19_10-55-0.png upload_2021-8-19_11-0-16.png
1. I only have a 12V switching power supply, not 15V. Is it possible to use a 12V power supply?

2. I want to use CD40106 for the IC in the picture, 2N2222 for NPN, and 1N5819 for the diode. There should be no problem, right?

3. How to choose the PNP transistor in the picture? It seems that the requirements are relatively high. Please recommend a commonly used one; I am going to buy it on Taobao.
And here is the detailed product article for your reference if you need it.
https://www.utmel.com/components/2n2222-switches-pinout-datasheet-and-schematic?id=178
The book says that the switch tube should choose a device whose steady-state collector current's maximum rating is greater than 21mA, and the transient collector's maximum rating is greater than 210mA.

A transistor with a maximum rating of collector and emitter voltage are greater than 15.3V.

Looking forward to your suggestion.

Yours sincerely,
TS
 

AnalogKid

Jun 10, 2015
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The schematics are completely unreadable. What are the functions of the two circuits? What is it you are trying to achieve?

Think. How are we supposed to advise you about selecting a transistor when we do not know the current through it or voltage across it? the link you posted goes to a page about the 2N2222 transistor, and says nothing about your circuit?

ak
 

Harald Kapp

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Nov 17, 2011
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mod edit: changes title from "ttriode" to transistor
 

Audioguru

Sep 24, 2016
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Attach the schematic as a "Thumbnail" so we can click on it which enlarges it. Here is what I see:
 

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