Thursday, April 11, 2019
Greer Amps Lightspeed
Wondered about this one for a while (but always suspected it was YATS). The best way to describe the Lightspeed (that I can think of anyway) is it's kind of like a Timmy with the bass and treble controls fixed and a simple treble cut tone control added just before the volume pot. The most interesting thing with this is the clipping, with 5 diodes in asymmetrical orientation (3 going one way, 2 going the other). Should fit in a 1590B or 125B nicely with board mounted pots.
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Schematics available?
ReplyDeleteThe Timmy's one should be easily available online. Start from there
DeleteWait, was it degooped? The lightspeed topic on FSB is dead since 2016 and DIYstompboxes never had one. That said, part count does match this pic https://images.app.goo.gl/Pwj37eYeH2np5nkC6
ReplyDeleteSchematic from the PedalPCB build doc for the "Mach 1"
ReplyDeleteThanks!
DeleteI think that this is a much better demo for the device
ReplyDeletehttps://youtu.be/paIp0B-VI4M
And I already started to build it because of Rabea's demo
Works well. Verified.
ReplyDeleteBOM DIA, O NE5532 funcionará legal para substituir o OPA2134?
ReplyDeleteAny dual opamp should work in the circuit.
Deleteobrigado!
ReplyDeleteI was already hoping someone had the nerve to ungoop the pcb and trace it. And here it is, thank you! And verified! Take notion though that the freq pot should be mounted in the opposite way in relative to the other two pots. In the layouts it says 1 2 1 which is a bit confusing. The 1 at the right should be the 3d lug. Smooth sounding pedal!
ReplyDeletethe diode 1n4007 can be used the same way in the layout as the 1n5817? thanks
ReplyDeleteYeah that should be fine
DeleteVoltage drop will be a bit higher
Deleteyeah!! obrigado!
ReplyDeleteHas any1 tried this with TL072?
ReplyDeleteof course, that should works great! in mine i tried 4558 and 1458. the 1458 was my choice more angry open sound! thanks.
DeleteI built it but have a squeal happening when drive and loudness reach a certain point with each other - when the drive is full up, the loudness will cause squeal when about half way. the same happens when the drive is lower but the loudness is higher. Anyone else encounter this?
ReplyDeleteAnyone have the gerber file of the PCB or the vectorized design of greer amps? Thanks
ReplyDeleteHi.... where do you solder the ground from the pcb? Thx
ReplyDeleteWorks like a charm and sounds amazing! I built mine with a 4558D chip, works fine. Thanks for the layout, this was my first vero build and it worked fine without any troubleshooting.
ReplyDeleteNoak -- I have a question about a Positive Grid amp model that you created. Please email me. thanks -- Ted
ReplyDeleteCan I replace the 1uF capacitor with a polarized electrolytic one? Thank you
ReplyDeletefine and usefull pedal, very pick sensitive. thanks!
ReplyDeleteI didn't expect much, as I thought this is just a copy of a Timmy, and was pleasantly surprised. I like it!
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ReplyDeleteHi all. What kind of capacitor ir the 1uF? Thanks
ReplyDeleteHello everyone. I ask it again. What type of capacitor is the 1uf? Thank you
ReplyDeleteI recommend trying it with a socket. It works with polarized electrolytic capacitors, film or ceramic. I use it with 470n.
DeleteI always know it's different、 but don't know what's better after a lot of iterations. lol
Ok thank you Tsukuba
Delete