people who complain about scratchy controls are overlooking leaky coupling caps and spending small fortunes on exotic cleaners.
nothing brings out noise on a pot like a small amount of dc (i use this very thing to evaluate potentiometers/faders in mixing consoles)
nothing brings out noise on a pot like a small amount of dc (i use this very thing to evaluate potentiometers/faders in mixing consoles)
Thanks Zman. I will have to order another one of these $40 cases (shipping included). They are exceptionally well made and a great bargain. I need to make one for myself - although the next one may be Juma's head amp - PCB's will arrive shortly.
yes exactly, for audio. (potentiometers are used for all manner of adjusting dc voltages but that's a different scenario)
if coupling caps have even small amounts of leakage it will increase "wiper noise"
don't take my word for it try it for yourself a 1.5 volt battery and a pair of clip leads are all that's necessary and an amp of course.
or better yet monitor on a scope and see.
this is one i learned from the Audio Cyclopedia years ago i'll have to look up the section and cite it when i find it.
if coupling caps have even small amounts of leakage it will increase "wiper noise"
don't take my word for it try it for yourself a 1.5 volt battery and a pair of clip leads are all that's necessary and an amp of course.
or better yet monitor on a scope and see.
this is one i learned from the Audio Cyclopedia years ago i'll have to look up the section and cite it when i find it.
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Looking good!! Remind me what is the size of the PCB, around 50 x 50 mm? What PSU are you planning to use?
Regards,
jdg123: That is killer alien metal art! To complete the 'just landed' look (and add some more cooling?) it needs some skids or tall feet!
Yes, that is 50x50mm. I will use the usual 25w toroidal trafo and CRCLC plus 7815/7915 regulators. Maybe I will use a cap multiplier this time.
Very nice. I love the re-purposed Dell Pentium heatsinks. Great value sinks and they look cool too.