Recent content by falco_femoralis

on a 1590G The original question was about big knobs on a 5 or 6 layout. I like to use these 18mm x 18mm rat style knobs

Google AI says this Risks & Limitations: A floating terminal can pick up noise, exhibit unpredictable leakage currents, or have lower reverse-breakdown limits (e.g., the B-E junction typically breaks down around 5V–7V, whereas the C-B junction can handle much higher voltages like 40V–75V). If...

Nice job on the fix! A quick tip when soldering is after feeding solder into the joint, instead of pulling the iron away and letting the solder sit there, run the tip of the iron up the lead of the component. Excess solder will wick to the component leg, while leaving just the right amount at...

100K? That's quite a jump up from 3k3. Can you explain some of the theory behind the functionality of R23? I would eliminate the toggle switch as it doesn't do much. If the potential of the Pentodes control is pretty much maxed out with the original design, then I'd remove the pot so it's wide...

Thanks Chuck. I'll build another and set up the mid control as you outlined. I'd also like a bit more from the Pentodes control, and I may delete it completely. Can I change R22 and R23 (voltage divider before V1 input of diff pair)? Perhaps lower R22 to something like 1.2k... Should R23 stay...

Does the op amp at the end sound different compared to the LTP emulation of the original? My favorite part of the circuit is the texture of the saturation with the Pentodes control cranked

Hi Chuck, thanks for putting this together. I'm looking into making a few PCBs using this schematic, as I like my Variac, but I'd like to dial the tone in a bit better with a mid control. What transistors can I use instead of the 2SK193s?

If the mounting to the chassis is done correctly, you could think of it like seeing a PCB mounted to two big fuck off transformers

I exceeded the 300 pin limit with my free version of Diptrace so I'm back to squeezing two boards in one enclosure. I purchased a nobleman so I can combine shipping costs and will do some point to point stuff to add the bass cut control.

https://docs.pedalpcb.com/project/PedalPCB-Boteh.pdf

I've noticed some circuits have Vref A and VREF B that bias each section of a dual op amp. Why? Both Vrefs are set with identical voltage dividers, so why are there two VREFs instead of just one? Thank you

This customer wants a Paisley Drive & ODR1 w/bass control in a vertical 1590bb as a combo pedal. Additionally, he also wants an AT+ in a vertical 1590bb so I think it'd be a fun challenge to make a custom PCB that can be populated for either setup. Given the ample space inside a 1590bb I think...

I'm talking to a guy about building him an ODR1 and he mentioned he likes the Wampler Belle as well. I've never really gotten into Wampler pedals, so I'm not really sure about the difference, but there is a 4th knob and maybe more gain? I'm thinking I could take a Nobelman board and do some...

Mad Prof Amber OD