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Chip Amps Amplifiers based on integrated circuits

TDA 2050 isolation heatsink
TDA 2050 isolation heatsink
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Old 3rd November 2017, 02:09 PM   #1
rahulrahullll is offline rahulrahullll
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Arrow TDA 2050 isolation heatsink

i made dual rail 2 peice tda 2050--working fine----separately---

----i am using a single transformer and single heatsink without insulator--


i know heatsink conected to tab -ve power----and heatsink would be live----

i arranged everything in box so that nothing gets connects to heatsink----

---------is it ok if i share 2-3 tda in same heatsink without insulator ?
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Old 3rd November 2017, 02:32 PM   #2
JonSnell Electronic is online now JonSnell Electronic  United Kingdom
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If you are using the same power supply and pin 3 of each device is connected together, there should be no issues but it is never recommended.
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Old 4th November 2017, 08:22 AM   #3
rahulrahullll is offline rahulrahullll
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thaank you------in future should i use mica or sillicone pads insulator or any other ?
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Old 4th November 2017, 08:29 AM   #4
rahulrahullll is offline rahulrahullll
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also is there any easy security--for amplifier overheating or failure--so that when device fails amplifier becomes disconnected open circuit-i was thinking of thermostat or any other way--

http://img.hisupplier.com/var/userIm...l_switch_s.jpg

https://guideimg.alibaba.com/images/...pcs_445081.jpg

---what do you suggest ?
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Old 6th November 2017, 01:06 AM   #5
nigelwright7557 is offline nigelwright7557  United Kingdom
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No reason why you cant use one heat sink without insulating washers.
Except if one amp fries it will also heat up other amps.

In lateral mosfet amps the mosfets have the source as case and they leave out insulating washers as they are at the same potential voltage.
As long as heat sink is isolated from metal case this is fine.

On a 1980's amp I built I put the amp in a wooden chassis.
Then I used two heat sinks, one for NPN output transistors and the other heat sink for pnp output transistors.
This meant I didn't need isolation tabs.
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Last edited by nigelwright7557; 6th November 2017 at 01:35 AM.
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Old 6th November 2017, 04:02 AM   #6
rahulrahullll is offline rahulrahullll
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also is there any easy security--for amplifier overheating or failure--so that when device fails amplifier becomes disconnected open circuit-i was thinking of thermostat or any other way--

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---what do you suggest ?
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Old 6th November 2017, 12:23 PM   #7
AndrewT is offline AndrewT  Scotland
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you can buy temperature switches.
Either normally open or normally closed and they both come in a wide variety of temperatures.
I have 70degC N.C. that I fit to the heatsink and that turns off the mains supply if the heatsink gets too hot. But it is not latched. It will come on again when the switch cools.
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Old 13th November 2017, 12:30 PM   #8
rahulrahullll is offline rahulrahullll
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but tda 2050 max is 150 c ------so i was thinking is it ok if i use 100 c switches ?
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Old 13th November 2017, 05:03 PM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by rahulrahullll View Post
but tda 2050 max is 150 c ------so i was thinking is it ok if i use 100 c switches ?
No.
The heatsink will be hotter than the switch.
The case (Tc) will be hotter than the heatsink.
The junctions (Tj) will be hotter than the case.
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Old 14th November 2017, 12:26 PM   #10
rahulrahullll is offline rahulrahullll
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thank you--------so you are telling i should use 70c n.c switch fot tda 2050 ?


----another weird thing----happening----

its almost a month using tda 2050--nice sound-----BUT-----


example---------last night playing amp for hours no problem----suddenly next day

when i switch on amp whether signal cable attached to pc out or not---vibrating shaky
sound coming out when i touch speakers they are vibrating without any signal applied but sounds ok when i play songs---------again on next day when i switch on amp its silent no vibrating everything works perfectly-------these events occurs randomely----weird-------

-----few people might say its--- hum --but why speaker vibrates when i touch them without signal--that means power is directly send to speakers without signal ?

--------i have not changed any wire or other thing from amp box or anything nearby are as it was earlier----in my area electric supply ac voltage varies a little bit like in summer 230 v ac in morning and at night 245 v--sometimes-----------using 2 tda 2050--16-0-16 v transformer--2 caps--2200uf/50v for each rail--after rectification filtration shows 22.5-0-22.5 v--circuit exact from datasheet soldered properly--no other issues playing for a month--------------

---updates---wow just now playing no vibrating--so throughout day it hapeen randomely--LOL---

------COULD NOT UNDERSTOOD THIS PHENOMENA ?----------

Last edited by rahulrahullll; 14th November 2017 at 12:56 PM.
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