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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Sat Sep 16, 2006 4:17 pm Post subject:
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Well,
It seems like the EQ effect has dropped off a bit.
And it actually seems more susceptable to the oscillations/overdrive.
It's definately a combination of having the gain up and the freq down.
From what I could see on the specanal the lower end of the frequency pot would put it at or below DC!
I haven't got the second channel connected yet. Would the lack of the second 10K pot make the difference? i.e. there's 10K across the inputs instead of 5K. I'll chuck a 10K across it and get back to ya. _________________ What makes a space ours, is what we put there, and what we do there. |
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Sat Sep 16, 2006 4:44 pm Post subject:
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Adding the 10K had no effect at all. Changing to a new battery did though!
I really need to build a nice benchtop PSU.
It sounds really good now. Still self oscillates with gain up and freq down, but it's a more "musical" oscillation, and is easier to get rid of.
It's drawing 12.5mA which seems okay. Could I get it any lower?
Is there anything I can do to better match the inputs? i.e. improve S/N ratio etc.
It's definately come a long way since you got back!
Thanks Jan. _________________ What makes a space ours, is what we put there, and what we do there. |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Sat Sep 16, 2006 5:12 pm Post subject:
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Uncle Krunkus wrote: |
It's definately come a long way since you got back!
Thanks Jan. |
You're welcome Andrew, but you really did it yourself, I didn't even ask the right questions, well one, maybe Glad though it goes forwards.
A poor battery BTW does have a high internal resistance, which does give trouble over the supply rails. the 100 uF cap you added was supposed to prevent that, but apparently it is not big enough, unless the battery was really in bad shape.
Next time I'll try to ask about the battery first.
Meanwhile, yes I think it would be useful for every DIYer to have a simple dual power supply with lets say 1 Amp of current (with a limiter preferably) and a regulatable voltage up to about +/-25 or +/-30 Volts or so.
But even a fixed one with +/-9V would be very useful I guess, the current limiter is quite handy for avoiding blowups sometimes, really nice to have. It's not too hard to build your own, you could even make it voltage controlled _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Sat Sep 16, 2006 5:20 pm Post subject:
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Oh, I know how easy it would be to make. I've got a nice 1.5Amp 18/0/18 transformer too. The problem is more one of available time, priorities, and laziness.
Maybe we should do a thread on how to put one together so everybody could follow along. Then again, I wonder about promoting the idea of people doing mains voltage projects, when we don't know the level of experience individuals may have. What do you think? Last edited by Uncle Krunkus on Sat Sep 16, 2006 5:24 pm; edited 1 time in total |
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blue hell
Site Admin
Joined: Apr 03, 2004 Posts: 24079 Location: The Netherlands, Enschede
Audio files: 278
G2 patch files: 320
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Posted: Sat Sep 16, 2006 5:24 pm Post subject:
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Wasn't laziness just the common word for prioritizing .. ? _________________ Jan
also .. could someone please turn down the thermostat a bit.
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Uncle Krunkus
Moderator
Joined: Jul 11, 2005 Posts: 4761 Location: Sydney, Australia
Audio files: 52
G2 patch files: 1
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Posted: Sat Sep 16, 2006 5:27 pm Post subject:
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I'm not sure,
My laziness is when I stop doing anything and go and have a sleep at 2pm. Prioritizing means I'm deciding what I will do next.
But I suppose I do sometimes do that in my sleep. _________________ What makes a space ours, is what we put there, and what we do there. |
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