Recent content by Blackboarcult

Si quieres encontrar a alguien que te haga la faena, te va a salir más a cuenta postear en inglés, amigo... Con la de herramientas en línea que hay para traducir, no debería de suponerte mucho engorro ;)

EXTRA clipping/distortion. More harmonic complexity and compression, etc.

Technically you could mimic any amp with a plexi topology: laney supergroup, sunn model t, park, traynor yb-something to name a few. Careful spice modelling will be required, though.

Unless there's a vactrol in there. Then a lenghty debate about light exposure and the LDR's ISO ensues, and nuthin gets done.

Gotcha. I had never thought of this when toying with opamp clipping. Generally bigger feedback resistor = smaller caps which makes me oh so happy, but I'll have to take that into account also. I've had the same experience. When building one of those small SS marshalls from the 80's, I compared...

Nice! I had it on my list to tinker with this one. The 1458 opamp clips in a fairly pleasant way too. But how do you get asymmetrical with 4558's, given that Vref is at 1/2 of V? It shouldnt be too far from symmetrical as is, right?

This. OTAs are the devil incarnate. One minute they pass sound, the other dead silent. Check connections, rebuild, nope, nada, rien, null. Also, the (original) TS9 sitting on my shelf. I have disassembled it three times, voltages - check, solder points - check, transistors, check, plug in...

That's so freakin cool. Did you use actual 3280's for the clipping section?

There ya go https://github.com/kanengomibako/ReverseEngineering/blob/main/BOSS/BD2W/BOSS_BD2W_schematic.png

Ace!!!! 🤘🤘 It does feel like it's hitting a bit too hard at the beginning, but I actually quite like that sound. I'll have to breadboard it :D Would probably sound even better with a Rat or SD-1 goosing it up...

I have an original JCM800 pedal. It does a pretty good job at mimicking the real amp, down to its quirks (too much bass when gain on max, not really fit for palm mutes without a tight OD in front, slightly harsher treble than one would expect). I wouldnt compare it to the SL drive - it feels...

Really, really cool idea! I can definitely see that working as a metal boost. But the wabbit jammies steal the show :D

I was under the impression that, the smaller the values on the voltage divider, the lesser the noise. Making it 10x does not increase noise, according to Spice... Interesting! 1Meg and 1uF do boost the gain and lower mids a little bit, but difference is minimal. Onwards To The Breadboard!!! ⚡⚡⚡

Thanks Chuck, I'm finally wrapping my head around muamps. So much to tinker with here... Ok, so all else in the circuit being equal, if I wanted to use J112 on Q4 and 2SK208R on Q3 (I like them a wee better than J201, more gate clipping and nice tone when source is directly tied to ground)...

What could be the purpose of R5 and R15? They are on the wrong side of the cap-to-gate to be an SRPP (à la Catalinbread), and I do not see that they affect the amount of gain of the stages, or the gain-to-load ratio either. The only thing it seems to do on my sim is lift the signal 1.3 volts...