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 Why is the PSM-5 circuit so complicated?		  New Topic  Reply to Topic
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JCM800PDX
Bronze Member

USA
88 Posts
Posted - 09/21/2009 :  03:27:07  Show Profile  Reply with Quote
I was just looking at the guts of my PSM-5 and there are a lot of components on that PCB! Two ICs, nearly a dozen transistors... I mean, isn't this pedal just a looper? Thoughts?

starr36
Platinum Member

Canada
1172 Posts
Posted - 09/21/2009 :  03:38:51  Show Profile  Visit starr36's Homepage  Reply with Quote
Thanks for asking this. I always wondered ... there's a few gurus here that will know.
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Laurie
Double Platinum Member

Canada
4854 Posts
Posted - 09/21/2009 :  04:41:01  Show Profile  Visit Laurie's Homepage  Reply with Quote
All the switching is done with FETs, and the opamps are input and output buffers.
Edited by - Laurie on 09/21/2009 04:41:18
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JCM800PDX
Bronze Member

USA
88 Posts
Posted - 09/21/2009 :  05:11:32  Show Profile  Reply with Quote
Interesting... so there's a possibility of the pedal altering your tone even in bypass mode? Maybe no more so than any other Boss pedal when it's turned off?
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zerksies
Double Platinum Member

USA
3406 Posts
Posted - 09/21/2009 :  13:56:04  Show Profile  Send zerksies an AOL message  Click to see zerksies's MSN Messenger address  Send zerksies a Yahoo! Message  Reply with Quote
it probably explains the tone loss and signal noise
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Laurie
Double Platinum Member

Canada
4854 Posts
Posted - 09/21/2009 :  13:59:17  Show Profile  Visit Laurie's Homepage  Reply with Quote
quote:
Originally posted by JCM800PDX
so there's a possibility of the pedal altering your tone even in bypass mode?
Yep. Not sure I'd have done it the same way.

The FET switching is OK (same as any other Boss pedal) but the opamp buffering is kinda wierd. Nearly every other Boss pedal has a FET or BJT buffer, on the input at least.
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JCM800PDX
Bronze Member

USA
88 Posts
Posted - 09/21/2009 :  19:46:41  Show Profile  Reply with Quote
I thought opamp buffers were supposed to color the tone less than a FET buffer... like the Foxrox wah buffer, which I believe is an opamp. Thanks for the reply!
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