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Author Topic: Appropriate Chip Selection  (Read 7130 times)

J M Fahey

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Re: Appropriate Chip Selection
« Reply #15 on: March 12, 2012, 07:10:21 PM »
1) to 3) google a couple 15 to 30W amp schematics, (Laney/Fender/Crate/Orange/Pavey) and check how they use their chipamps. You won't find LM1875 but a *lot* of TDA2030/2050 which are used the same way.
Same pinout and everything else.
Your PT should be rated 40 to 60VA.
Obviously if you find a bargain 75 to 120VA one cheaper than, say,  a regular 50VA one, go for it.
5) the commercial amps will use the zobel network, copy it.
6) don't worry about the pop, no mid or small sized amp cares about it, it breaks nothing anyway.
7) the green wire must be safely bolted to the chassis and must be at least 1 inch longer than the other 2 , so if somebody pulls the power cord heavily the others snap before the ground one.
Unlikely but costs nothing, so ...
Good luck.

EDIT: make the PSU and power amp first, and test it with a speaker and an MP3 or CD player straight to its input.
When you are sure everything is fine, go on with the preamp.
« Last Edit: March 13, 2012, 04:38:00 AM by J M Fahey »

paku5535

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Re: Appropriate Chip Selection
« Reply #16 on: March 13, 2012, 12:19:45 AM »
thank Fahey for your input...

joecool85

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Re: Appropriate Chip Selection
« Reply #17 on: March 15, 2012, 10:29:13 AM »
Juan forgot two things.

1.  Have fun.
2.  Post here with your results!
Life is what you make it.
Still rockin' the Dean Markley K-20X
thatraymond.com

paku5535

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Re: Appropriate Chip Selection
« Reply #18 on: March 16, 2012, 02:40:17 PM »
ofcourse!!

J M Fahey

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Re: Appropriate Chip Selection
« Reply #19 on: March 17, 2012, 04:45:03 AM »
Sorry.
I should make that part of my signature ;)
And yes, it's all about having fun here and sharing our experiences with friends. :dbtu:
Cool site.

Or, should I say .... joe-cool ?  :lmao: