TDA7293 datasheet - Page 5 - diyAudio
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Old 18th January 2013, 04:40 PM   #41
Mooly is offline Mooly  United Kingdom
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Quote:
Originally Posted by Kitax View Post
woops... didnt expect it to be this large... XP
You just can't get the staff

They are to small.

A spur is a short piece of wire tee-d off the main connection between the two caps. The connection between the caps carries huge (10's of amps) charging pulses. The spur does not.

This could be OK for a heatsink and would take two IC's.
HSVM100 - VELLEMAN KIT - HEAT SINK FOR K8060 | CPC

It is originally for the Velemann "200 watt" amplifier.
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Old 18th January 2013, 07:43 PM   #42
Kitax is offline Kitax  Latvia
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oh... this is grate, but i think i cant get it... guess ill have to get one with simmilar parameters
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Old 18th January 2013, 08:03 PM   #43
Kitax is offline Kitax  Latvia
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oh **** i just realized, why i couldent find the heatsink... i was looking at the wrong parameter... actually the max temperature was 150, so i can pick any heatsink, that is 1.4 or smaller

goD, im so happy right now
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Old 18th January 2013, 08:32 PM   #44
Kitax is offline Kitax  Latvia
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only problem though is that in our local store they doesnt show the C/W... :S
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Old 19th January 2013, 10:13 AM   #45
Kitax is offline Kitax  Latvia
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befor you said, that i should add a rezistor and cap in between the diode bridge...
how big should the rezistor be? (i mean watts) would 1/4W
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Old 19th January 2013, 10:21 AM   #46
Mooly is offline Mooly  United Kingdom
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It should be a carbon or metal film type of around 1 or 2 watts rating. Small resistors can be stressed by constant (normal) variations in the mains voltage (and hence variation and sudden current spikes). In theory they should be fine... in practice you need the 1 or 2 watt rating for long term reliability.
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Old 19th January 2013, 11:38 AM   #47
Kitax is offline Kitax  Latvia
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if i want to include the mute function... do i need to get a small voltage source?
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Old 19th January 2013, 11:43 AM   #48
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Quote:
Originally Posted by Kitax View Post
if i want to include the mute function... do i need to get a small voltage source?
If you want a button to press to mute the amp then thats easy... just follow the data sheet example (fig 6a) No separate voltages needed, it uses the amps rails. Data sheet specifies 120 volts allowable above the negative rail so no problems.
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Old 19th January 2013, 01:09 PM   #49
Kitax is offline Kitax  Latvia
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oh... (i guess you ment fig5...)
then that means that i can use the +36V... that is grate...
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Old 27th January 2013, 03:44 PM   #50
Kitax is offline Kitax  Latvia
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i want to make a power indicator, and put it between +36 and -36V powersource, and i want to know how big of a rezistor should i put there... actually i want to make sure, that i am right, and with 3.5V (blue) diode i should put a 3.6K ohm rezistor (1/4 watt)
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