Thursday, May 31, 2018
Run Off Groove Mockman 2.0
Continuing to knock out the last few ROG designs I haven't laid out. This one's a pretty easy little circuit, emulating the distortion in Rockman amps designed an used by Boston guitarist Tom Scholz. The toggle allows you to go between 80s (classic) and 90s (modern) tones, and it should all fit in a 1590a. Schematic, sound clips and more info on the ROG site.
What is the value of Cx?
ReplyDeleteCheck the notes and schematic on ROGs website.
ReplyDeletehttp://runoffgroove.com/mm2.html
IC1 - 4558?
ReplyDeleteVerified!!
ReplyDeleteVery bright distortion (I use a strat), decent sounding, I used a JRC4558, I wonder if it is possible to add a tone control...
Please try ROG Tri vibe, hopefully to fit in a a 1590B enclosure.
ReplyDeleteI used a 330pf and a 4558D...Sounded pretty good! Cool the Engines!
ReplyDeletethe 330pf capacitor did you use it as Cx?
DeleteThe capacitor is to taste. 330PF the guitar fx layout website mentioned. It's really to taste. 470pf is a good place to start. Now the IC chip.
ReplyDeletecopied off their website. Literacy is a gift as saw this comment a while ago.
The original op-amp was an RC1458, however you are encouraged to audition any dual opamp, as this component is an integral part of the sound. The JRC4558 opamp works quite well. Some faster/better op-amps like TL072 and NE5532 produce a slightly brighter sound. Modern rail-to-rail opamps like TLC2262 and TLC2272 sound a bit louder and better defined. In particular, our favorite op-amps were the JRC4558 and TLC2262.
Great sound with 391pf to cx,ic ne5532.
ReplyDelete47nf to 68nf,6.8nf to 22nf.
Thanks for your beatiful layout fornecer!!!
I don't hear much of a difference when using the switch. What circuit is added or removed?
ReplyDeleteIs the switch change subtle?
Does anyone have any ideas for adding gain adjustment pots?
ReplyDeleteI have built and played with many of these and it is time to adjust the gain.
I build it several time and improved it with gain control, just replace 10K resistor on input with 100K or 250K potentiometer (just check on gain calculation). For CX capacitor (filter for removing/reducing oscilation) you can tweak with some value from 330pf to 10n (the results vary in sustain output) . It works to me and i hope working for everyone. Happy build everyone, cheers!
ReplyDelete