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Old 4th March 2007, 05:08 PM   #341
mravlcax is offline mravlcax  Slovenia
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Default TDA1557Q

So here it is my finished amp with PS connector.



Sorry for so many posts!
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Old 4th March 2007, 06:28 PM   #342
FastEddy is offline FastEddy  United States
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Niile: Very impressive ... external PS drive several stages. Wondering how this works ... The PS appears to be able to daisy chain several devices at once. Extra filtering in each seperate stage = it would be nice to see a diagram w/ treatments for this extra filtration ... Also noticing the grounding scheme. I have kept chassis / power line grounds seperated except in the power output stages myself, isolating small signal stages from the power line shields & ground ... to reduce ground loops, etc.

Re: http://kuvablogi.com/nayta/163398/ ... Without an english explaination I'm wondering what this 'scope trace is about?? Looks like 60 Htz. modulated with 1K Htz on the speaker output ?? What is it ??

Nice ideas, nice execution ...
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Old 8th March 2007, 05:05 PM   #343
Niila is offline Niila  Finland
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Thankie

Quote:
Niile: Very impressive ... external PS drive several stages. Wondering how this works ... The PS appears to be able to daisy chain several devices at once. Extra filtering in each seperate stage = it would be nice to see a diagram w/ treatments for this extra filtration ... Also noticing the grounding scheme. I have kept chassis / power line grounds seperated except in the power output stages myself, isolating small signal stages from the power line shields & ground ... to reduce ground loops, etc.
What do you mean with driving several stages? And daisy chain?!? The PS only contains BrianGT's basic PS board and trafo.

About the grounding issues, i agree it would be a good idea. I need to work on it.

Its an old picture of my school works (lm4780) output. It oscillated quite badly but later on i discovered i had too small gain resistor. Now it works fine.
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Old 8th March 2007, 06:16 PM   #344
FastEddy is offline FastEddy  United States
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" ... the grounding issues, i agree it would be a good idea. I need to work on it. ..."

Also you might consider some kind of "push and twist" or BNC type connector for the power supply = more reliable, etc.
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Old 10th March 2007, 05:02 PM   #345
Niila is offline Niila  Finland
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Nah, XLR connectors are fine. Im not hanging these in the air when listening
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Old 12th March 2007, 12:28 AM   #346
sinigersky is offline sinigersky  Germany
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Default A one-sunday project: super kitchen radio

I made a unique, I hope, radio for kitchen application using following steps:

- bought an old YAMAHA hifi tuner from ebay for 15 EURO
- built in a toroidal transformer and a small LM4755 self made board
- mounted volume control switch & speaker connectors

I got an unexpectedly good sound with my Magnat Sound Force 1200 speakers! Powered by a single-ended 20 V stabilized power supply, this can be really loud for a radio - can be used for parties, too! This small IC is perfect for applications like this - where low power & simplicity are needed.

Cheers!

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Old 12th March 2007, 06:02 AM   #347
Variac is offline Variac  Costa Rica
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Looks like you invented the receiver!
BUT a very good sounding one as you mention.
Another good point you make is that the amps can fit into existing components- how about a cd player with amp? I remember opening a CD player once that was half empty inside...
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Old 12th March 2007, 08:25 AM   #348
sinigersky is offline sinigersky  Germany
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Yes, it became a simple receiver
Two speakers mounted on both sides of the case are still missing - then we get a non-portable boom blaster

The Philips CD723 is a good candidate for mounting an amp inside :-)
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Old 15th March 2007, 01:16 AM   #349
karma is offline karma  Canada
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nice work. i bet it sounds good.
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Old 15th March 2007, 03:21 AM   #350
FastEddy is offline FastEddy  United States
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sinigersky: Very well done, nice conversion.
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