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Friedman - Buxom Boost  [traced]

Posted: 13 Jan 2018, 02:28
by bugg

Re: Friedman - Buxom Boost

Posted: 15 Jan 2018, 08:02
by Lithium_Grim
That is a complex powersection. Why so complex, normally a -9v requires a lot less components? Can anyone give some insight?

Re: Friedman - Buxom Boost

Posted: 15 Jan 2018, 18:45
by toneman
Q1 and VR1 form a preregulator for the LT1054 which is sensitive to overvoltage.
Too much input and POOF!
U could do this with 2 9V batteries but what's the fun in that?
8)

Re: Friedman - Buxom Boost

Posted: 02 Feb 2018, 02:02
by LeroyP
The first to op amps have gains of only 1.47 each?? Is that right?? With the gain control turned up full the total numerical gain for the three stages combined is only around 20 (26db).
This could be achieved by having one stage and a 200k pot instead of the three stages plus the 100k pot.

Am i missing something??

Thanks
Leroy

Re: Friedman - Buxom Boost

Posted: 14 Feb 2018, 15:22
by alexradium
LeroyP wrote:The first to op amps have gains of only 1.47 each?? Is that right?? With the gain control turned up full the total numerical gain for the three stages combined is only around 20 (26db).
This could be achieved by having one stage and a 200k pot instead of the three stages plus the 100k pot.

Am i missing something??

Thanks
Leroy
26 dB is plenty of gain for any application,as a clean boost,the use of more stages is because of the tight filter to work independently of the volume boost and be separated from the guitar input.
Even if you could kill 3 birds with one stone,why not throwing a couple more for fun if it doesn't cost much more,i mean 2 or 3 TL072s cost very low money,they are machine mounted in big quantities and the pedal sold to more than 200.

Re: Friedman - Buxom Boost

Posted: 28 Aug 2018, 08:36
by screamingdemon
Question i orderd the pcb but what type of caps should i use.Panasonics stacked metal film or polyfilm.

Re: Friedman - Buxom Boost

Posted: 28 Aug 2018, 16:15
by plush
screamingdemon wrote:Question i orderd the pcb but what type of caps should i use.Panasonics stacked metal film or polyfilm.
Just by it looks, the pcb is designed to use boxed capacitors (epcos, wima, arcotronics and others) with 5mm lead spacing (63-100v), but you can use any other type that fits - polyfilm, metal film, ceramics etc with no tonal difference. Just avoid using cheap unbranded caps.