Hi from a new Kid on the Block.
I came across this forum whilst looking for the Motorola application note AN-483 on Darlington power amplifiers. I found reference to this note in an article in the Aug 1971 copy of Wireless World.
This has all come about because, I’m thinking of playing with a pair of ‘79 made HH TPA25-D power amplifiers, and going by the circuit layout & following the PCB it appears to use (Motorola) Darlington transistors marked with custom HH pt #’s. I’ve also noted there are a few other small similarities between the Motorola circuit in WW and the HH TPA.
The AN-483 thread is in the following post: http://www.diyaudio.com/forums/showthread.php?threadid=99967
Hopefully I’ll be able to get in contact the members who said they have the application note.
And me – Well I’m an engineer employed in the UK electronics industry, but at heart I’m an audio DIYer. This comes from playing with discarded Quad II, Decca & Leak TL12+ gear when I was a Kid of thirteen back in 1973. My first job was building valve guitar amplifiers.
Terry.
I came across this forum whilst looking for the Motorola application note AN-483 on Darlington power amplifiers. I found reference to this note in an article in the Aug 1971 copy of Wireless World.
This has all come about because, I’m thinking of playing with a pair of ‘79 made HH TPA25-D power amplifiers, and going by the circuit layout & following the PCB it appears to use (Motorola) Darlington transistors marked with custom HH pt #’s. I’ve also noted there are a few other small similarities between the Motorola circuit in WW and the HH TPA.
The AN-483 thread is in the following post: http://www.diyaudio.com/forums/showthread.php?threadid=99967
Hopefully I’ll be able to get in contact the members who said they have the application note.
And me – Well I’m an engineer employed in the UK electronics industry, but at heart I’m an audio DIYer. This comes from playing with discarded Quad II, Decca & Leak TL12+ gear when I was a Kid of thirteen back in 1973. My first job was building valve guitar amplifiers.
Terry.
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