Velleman K4003 / TDA2616 - turn on/off pops - diyAudio
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Old 29th October 2012, 03:05 AM   #1
IG81 is offline IG81  Canada
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Default Velleman K4003 / TDA2616 - turn on/off pops

Hi,

I just assembled a K4003, based around the TDA2616 chip. Despite what is stated on the TDA2616 datasheet, I'm getting loud clicks and pops, at turn off mostly. I'm feeding the circuit with a Hammond 166L25, for a final DC supply of 19V. I measure DC offsets of ~30-40mV for each channel. What could be the problem here? The K4003 is the exact application circuit from the datasheet, I don't get it.

Other than that, I'm getting a clean output waveform up to 9.2V, for ~10.5W into 8ohm and it seems to sound fairly good.

IG
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Old 29th October 2012, 06:08 PM   #2
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What kind of power switch are you using? I had the same trouble until I went with a heavy duty spst switch from parts express. Swap out switches and see if it helps.
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Old 29th October 2012, 06:22 PM   #3
IG81 is offline IG81  Canada
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Quote:
Originally Posted by cervelorider View Post
What kind of power switch are you using? I had the same trouble until I went with a heavy duty spst switch from parts express. Swap out switches and see if it helps.
I'm using a pretty simple rocker switch, made for AC 120V. I've used these a few times in other projects with no problem. I can try a swap. So would this be switch bounce? Thanks for the input!

IG
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Old 29th October 2012, 06:24 PM   #4
balerit is offline balerit  South Africa
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If the chip is anything like the TDA 1558Q or similar chips you need a circuit add on to hold the mute pin low while the amp is powering up.
Mac
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Old 29th October 2012, 06:29 PM   #5
IG81 is offline IG81  Canada
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Quote:
Originally Posted by balerit View Post
If the chip is anything like the TDA 1558Q or similar chips you need a circuit add on to hold the mute pin low while the amp is powering up.
Mac
I might have to look into this if all else fails perhaps, I have not given the mute function any look so far.

IG
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Old 29th October 2012, 07:03 PM   #6
balerit is offline balerit  South Africa
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Have a look at the TDA 8560 datasheet page 11, for a similar circuit for the mute, though mine is simpler consisting of a cap and 2 resistors and a switch.
Mac

Last edited by balerit; 29th October 2012 at 07:07 PM.
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Old 29th October 2012, 07:54 PM   #7
IG81 is offline IG81  Canada
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Quote:
Originally Posted by balerit View Post
Have a look at the TDA 8560 datasheet page 11, for a similar circuit for the mute, though mine is simpler consisting of a cap and 2 resistors and a switch.
Mac
Interesting. The TDA2616 would want the opposite: to have some current (300A into ~9K input Z) go into the mute pin at startup, then slowly ramp it down for normal function. If changing the switch or de-bouncing it does not work, I wonder if I can make something with a Zener, resistor and capacitor towards this end. But I think the mute function only takes out the input section, so any transient generated by the switch might still make it to the outputs.

IG
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Old 29th October 2012, 11:08 PM   #8
IG81 is offline IG81  Canada
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A little blue X-type capacitor, 47nF, accross the switch did the trick, I only get very faint clicks now, with my ear to the tweeter. It's better than swapping the switch at this point since the hole is made.

IG
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Old 30th October 2012, 03:32 AM   #9
IG81 is offline IG81  Canada
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Here is a shot of this little amp, driving a Philips 9710 (rather appropriate) in a Karlson:

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

IG
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Old 30th October 2012, 12:52 PM   #10
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Gorgeous! I bet that combo sounds wonderful.
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