Point 2 Point (no PCB) for TDA7293, TDA7294, TDA7295, TDA7296. - Page 15 - diyAudio
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Old 6th July 2013, 02:35 AM   #141
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Quote:
Originally Posted by danielwritesbac View Post
Sparks? That's construction error. The connections are a bit flimsy and voids are causing sparks, so you need MUCH THICKER traces (probably needs reinforced with wire and solid soldering).

Also, the pi filter resistors need to be paralleled with minimum pin length and not look like a fishing net.

I think I see a ground loop that might cause dulling, so that needs fixed. Hey, I've made a drawing for you.

The green traces have the conductor Thickest to Farthest caps.
Or simply use the same length of cable to each cap from the star. It pays to match.
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Old 7th July 2013, 08:01 AM   #142
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Default more

look
Mr Daniel...
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Old 7th July 2013, 12:05 PM   #143
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Wow. That's rather genius and compact for low inductance too. Nice!
Question: What value are the four largest caps in the photos?
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Old 7th July 2013, 09:33 PM   #144
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220uf 63V was what i wanted but only had 100V
so that was used.
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Old 7th July 2013, 09:46 PM   #145
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Talking Thanks!


just expect those donŽt blow!
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Old 7th July 2013, 09:48 PM   #146
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iŽll wait to check this as is, and then add snubbers and
or smaller-bypassing-larger caps.
the one 220uf 63 that i had is for the fb-string,
should i bypass it with diodes?
and how doyou see the heatsink? what be better,
put the tabs directly onthe large Al piece?
or use the small plate first?
IŽll be using a fan fullspeed alltime, blowing into
the case and out at the other end.
Using both pieces to make U channel

Last edited by martin martinez; 7th July 2013 at 09:59 PM. Reason: add more
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Old 8th July 2013, 04:29 AM   #147
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This is for double circuit, master-slave
to drive two 8 ohm speakerboxes
from fender passport 250.
Tbe used with a simple integrated
mic-line mixer, w builtin eq and efx
power derived from same psu.Need
to feed two +-12 V regs, and one
5V forthe efx module.
the mixer was brought burnt PS,
and no amp.
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Old 10th July 2013, 01:54 AM   #148
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Default preregs from soundwesthost

this is going slow....
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Old 10th July 2013, 06:31 AM   #149
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Quote:
Originally Posted by martin martinez View Post
the one 220uf 63 that i had is for the fb-string, should i bypass it with diodes?
That value NFB-Shunt-Cap is small enough that it doesn't need diode bypass; however, 220u is big enough that you might want a little bypass cap for treble helper.
Quote:
Originally Posted by martin martinez View Post
and how doyou see the heatsink? what be better, put the tabs directly onthe large Al piece? or use the small plate first? IŽll be using a fan fullspeed alltime, blowing into the case and out at the other end.
Well, I like it done normally. Watch out--those tabs have voltage!
Shoulder washers on tabs, tabs to insulating layer, insulating layer to big aluminum stuff, make the amp run cool stable and efficient so you can throw the fan away.
Enclosure with air intake vent and air output vent, and without needing a fan the warm heatsink will cause hot air to exit at/near enclosure top if when cool air is allowed to enter at near enclosure bottom. . . so you put the heatsink into this nonstop voluntary fanless draft of air to cool it.
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Old 10th July 2013, 09:18 PM   #150
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yes thanks! my problem is room temp is really hot, and amp will
most surely, be used full blast nonstop- for hours. ThatŽs why thereŽs a fan.
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