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Spot the deliberate mistake

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djeddie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2015 at 9:16pm
I wonder who did the soldering, the blind guy or his guide dog?
Chas n Dave : it's like Drum and Bass but with beards.             E=mc² ±3dB
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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 18 March 2015 at 10:02pm
The plaster guy, he used a trowl.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote odc04r Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2015 at 9:12am
Can't tell if it has actually gone bang, or is just covered in crud and a very badly installed capacitor.
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mini-mad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2015 at 11:26am
Originally posted by djeddie djeddie wrote:

I wonder who did the soldering, the blind guy or his guide dog?
his dog.... you can tell. It was 'paw' effort on his part lol
If it sounds like a gorilla is trying to escape, turn it down.
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djeddie View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote djeddie Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2015 at 9:30pm
Originally posted by mini-mad mini-mad wrote:

Originally posted by djeddie djeddie wrote:

I wonder who did the soldering, the blind guy or his guide dog?
his dog.... you can tell. It was 'paw' effort on his part lol


Suppose so... it did look quite ruff. Wink
Chas n Dave : it's like Drum and Bass but with beards.             E=mc² ±3dB
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mini-mad View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mini-mad Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2015 at 10:55pm
Originally posted by djeddie djeddie wrote:

Originally posted by mini-mad mini-mad wrote:

Originally posted by djeddie djeddie wrote:

I wonder who did the soldering, the blind guy or his guide dog?
his dog.... you can tell. It was 'paw' effort on his part lol


Suppose so... it did look quite ruff. Wink
a bit of DOG-dgy soldering and 'WOOF' gone in a flash!
If it sounds like a gorilla is trying to escape, turn it down.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2015 at 11:02pm
I'm more annoyed that the wrong capacitor was bodged in on stilts when the correct capacitors are available.

The other bodge is that there are 3 different output transistors in a row. Another half-arsed repair that has to be dealt before the current fault is traced.
Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote _djk_ Quote  Post ReplyReply Direct Link To This Post Posted: 19 March 2015 at 11:13pm
"The other bodge is that there are 3 different output transistors in a row"
 
Might be OK as they are all PNP, they are usually like peas in a pod. NPN's however vary all over the map as far as gain goes.
 
I buy in trays of 100pcs and write the gain on each with a sharpie, it's a waste of time with the PNP's. It's very needed with the NPN's.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2015 at 3:01pm
Crown also match by Vbe as well as gain. In the UK that would be just under 2 grand for a tray of 100 transistors or $2700

Nice work it you can get it

Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2015 at 3:03pm
Geni OBY3 moving head with various faults this being one of them.

Kevin

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Post Options Post Options   Thanks (0) Thanks(0)   Quote MattStolton Quote  Post ReplyReply Direct Link To This Post Posted: 23 March 2015 at 3:12pm
That chip is pissed, at least a bit legless....
Matt Stolton - Technical Director (!!!) - Wilding Sound Ltd
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Post Options Post Options   Thanks (0) Thanks(0)   Quote kedwardsleisure Quote  Post ReplyReply Direct Link To This Post Posted: 21 April 2015 at 1:11pm
Mackie SWA1501.
Been to another dealer twice who couldn't find the fault.
Symptoms: Volume goes up & down on its own



Kevin

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