Build your own 100W classA power amp

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TonyTecson

TonyTecson

Member
Joined 2003
#1
Whilst downloading Audio magazines here: AUDIO - Consumer audio and music magazine from 1947 to 2000.

i chanced opun a 1995 edition about a 100w class A amp by Norman Thagart:

part 1: https://worldradiohistory.com/Archi...tu34fta2pKBdd2ikr_ZXd6U-ka40d9A3hwSVwEco2D-wM

part2: https://worldradiohistory.com/Archi...PNVytNdEr_d0W_Mwrkn8hETqCz7PtE4E0w8eMlHNeanZE

part 3: https://worldradiohistory.com/Archi...HNacs6fkqGSS6gq0XvADNChbQRnGQZpo86U3PmWvm7DY4

the 3 art article is complete with all information needed to build this amp, so i wonder if anybody here besides the author built these monoblock amp. looking for your feedback...
 
#2
I also was interested in this subject as I am not a follower of IGMosfets .


They initially appeared with a great fanfare at the time and circuits appeared for them in audio applications although power supply designers seemed to like them ,some like JLH were not so keen on them in audio .


ECSTUFF4U for Electronics Engineer: Advantages and disadvantages of IGBT


I notice class A is mentioned here which -IMO can cover up some basic design faults , I would like to see a class AB or even class B get praise from audio enthusiasts to get a balanced opinion.
 
#4
Who mentioned IGBTs? MOSFET is by definition an IGFET, so "IGMosfet" is a tautology and nothing to do with IGBTs, other than that the cascode used in the amp is roughly equivalent to an IGBT in properties I suppose, although its function is to prevent thermal instability by keeping the FETs cool.
 
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