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Class D Switching Power Amplifiers and Power D/A conversion

Memphis PWM Drive Board
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Old 24th June 2018, 02:53 PM   #1
cajones65 is offline cajones65  United States
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Default Memphis PWM Drive Board

I am looking for a part number for Q3, Q6, Q8. They all have the same marking "PB". Everywhere I have looked says that is a zenor diode. But it is a transistor PNP BJT SOT23 case. This is in a Memphis 16-MC1.4000
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Old 25th June 2018, 02:48 PM   #2
doctormord is offline doctormord  Germany
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Could be a KRA102S PNP Transistor.


Datasheet:
http://www.diyaudio.com/forums/attac...1&d=1529934500


If its NPN, then maybe 2SC3295-B.
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Last edited by doctormord; 25th June 2018 at 02:56 PM.
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Old 25th June 2018, 04:19 PM   #3
cajones65 is offline cajones65  United States
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Thank you doctorord, that is actually the part# that I finally found. Just wanting to make sure someone else had it. Again thank you
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Old 25th June 2018, 04:42 PM   #4
doctormord is offline doctormord  Germany
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Yes, it's the datecode format that makes it more clear. All other "PB" marked transistors are marked in a different way and NPN.


Best practice would involve a component tester and a desoldered part to test.


Like these:
All-in-1 Component Tester Transistor Diode Capacitance ESR Meter Inductance ark 898149544130 | eBay
Component Tester Transistor Diode Capacitance ESR Meter Signal Generator Tool | eBay
Sale LCR-T4 Component Tester Transistor Diode Capacitance ESR Meter Inductance # | eBay


I use a DIY one:
Transistortester/Komponententester – das Universalgenie – #360customs
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