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Old 17th February 2009, 10:48 PM   #191
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Hi Richard,
This is the link I can't see in your picture, is it underneath?
If so, any chance of a bottom shot
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Old 17th February 2009, 10:51 PM   #192
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Quote:
Originally posted by audio1st
Hi Richard,
This is the link I can't see in your picture, is it underneath?
If so, any chance of a bottom shot
Well spotted! but ive just soldered the link in place
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Old 17th February 2009, 10:57 PM   #193
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Remember I get 27v from the Zener and 34v from the first BD140 (-v)
So I am guessing the problem is between these two points.

I haven't had much time on it tonight because the wife wanted me to watch 'Mistresses'...such a shame
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Old 17th February 2009, 11:15 PM   #194
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Tidy on top...messy on bottom!

Click the image to open in full size.

This picture was taken before I added the link to the collector pin of the BD912, I have only added it to the -v side for the time being.

There is a blob of solder on the -v side where the zener and the J309 meet....I carelessly soldered the J309 one row too high and then had to bridge the connection.

I'm off to hit the hay!
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Old 17th February 2009, 11:21 PM   #195
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I can see no break in the copper from in to out?
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Old 17th February 2009, 11:39 PM   #196
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Richard,
Cut at Black marks and link at Red..
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Old 18th February 2009, 07:24 AM   #197
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Quote:
Originally posted by audio1st
Richard,
Cut at Black marks and link at Red..

Thanks Barry

I will check again this evening.

I have added a link after the BD912, between the collector pin and v-

This was added just before this photo was taken
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Old 18th February 2009, 07:30 AM   #198
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Hi Richard,

The Link must be just before the 911 and 912. Not after..
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Old 18th February 2009, 08:09 AM   #199
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I hope this shows it better..
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Old 18th February 2009, 09:01 AM   #200
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by Tripmaster



I am using a 40w bulb for this test


Q1> Is the bulb off when there is no load and the ON switch is held down?

[COLOR=black]A1> The bulb lights for less than a second


Q2> Does the bulb react in any way when you connect a load and hold the ON switch down?


A2> As above


Q3> Can you arrange a big load to light the bulb? and does it o off when you press the BYPASS?

A3> I placed a 1K3 resistor between V- and Ground, the bulb lights as above and the bypass switch has no effect.

this is not right.
The bulb must be off when both switches are off.
The bulb must not flash, not even briefly nor dimly, when the ON switch is pressed and there is no load.

The bulb must go out, if it is already glowing or lit, when the bypass switch is pressed.

A big load would be a kettle, fan heater, iron, toaster etc.
__________________
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