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Old 25th January 2009, 03:20 PM   #1
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Join Date: Jan 2009
Default Hi from a new Kid on the Block.

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, Iím thinking of playing with a pair of Ď79 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 #ís. Iíve 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: Anybody have scan of AN-483B (Motorola)?

Hopefully Iíll be able to get in contact the members who said they have the application note.

And me Ė Well Iím an engineer employed in the UK electronics industry, but at heart Iím 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.

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Old 26th January 2009, 05:00 PM   #2
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Join Date: Jan 2004
Location: Near Vancouver
Hello Terry and welcome to the forums.
planet10 needs your help:
Let's help Ruth and Dave
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