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Old 20th November 2012, 02:20 PM   #591
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Nice!
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Old 20th December 2012, 12:09 PM   #592
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Gents,
how to make sure b1 is assembled properly before connecting it to the power amp and speakers ?
first timer, not so confident plugging in...
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Old 20th December 2012, 02:11 PM   #593
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I'm not engineer but i've built several projects and i always follow my own rules and common sense:

- always check twice solder joints and measure continuity searching shorts or bad connections
- check transistor orientation, be sure you don't connect it backwards
- before powering up check PSU voltages, if they arecorrect it's time to cross your fingers

IMPORTANT! forgot to mention:
don't plug it to poweramp at first, it's better to apply power and look for smoke, etc....if everything seems fine connect a source (better a TONE GENERATOR) to preamp input and check output with a DMM). If everything seems fine then connect it to poweramp with volume all way down, switch on, press play on source and turn it up!

I'm sure you'll find better and more technical answers from nice people here!
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Old 20th December 2012, 03:07 PM   #594
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Thank you
I am using 2 9v batteries for now (basically I bought cheap pcb kit from ebay to practice on, and it was apparently very good decision, as I have some doubts about quality of assembly, and my ldr kit, plus salas psu are waiting for b1 being done).
As I know I can measure some components for specific voltage values and to compare them to given optimal ones- this is I am looking for. If anybody can assist- will much appreciate it..
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Old 23rd December 2012, 11:12 AM   #595
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ok
I have tested b1 now.
plugged it into amp, cd and speaker.
but it fired on a full volume, I switched off it for a moment, moved potentiometer to opposite side and result remained the same.
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File Type: jpg 2012-12-23 12.04.37.jpg (713.8 KB, 165 views)
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Old 23rd December 2012, 01:23 PM   #596
6L6 is offline 6L6  United States
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Are you saying that it's not working?

The above photo shows no selector switch or jumper, you might have an open circuit.
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Old 23rd December 2012, 02:09 PM   #597
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It is working- on a full volume with no response to potentiometer.
If it is the input selection problem how to place jumper on it then ?

BTW Thank you for response
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Old 23rd December 2012, 02:12 PM   #598
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?????

That's odd. Something is wired incorrectly.

May we see a well-lit, in-focus photo of your B1 as it is right now? That would be a tremendous help.
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Old 23rd December 2012, 03:18 PM   #599
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Cannot upload pics "because security token is missing".
Dropbox:
first
second
full size uncompressed third
I got very bad quality solder, and then I made a mistake with capacitors- had trouble desoldering.
Then I had light diode polarity wrong- and again had desoldering nightmare- for now in place of diode I put a wire jumper.
rest of the things supposed to be ok, not sure about Jfet though...
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Old 23rd December 2012, 03:32 PM   #600
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Thank you! That helps. Your photos are very good quality.

A photo of the bottom of the board would also be nice, to see if you have any bad solder joints.

The problem is that your photos don't show how you are connecting your inputs and outputs. That's where the problem might be.

Without the switch in place I haven't a clue how you are getting a signal to the outputs. ?? Since you say you have full output it makes me think that you are somehow connecting the source directly to the output somehow.
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