Looks pretty similar to Aphex's Aural Exciter. It was a hit in the 70's but soon people got tired of it.I've been guilty of building some similar products, but never of using them!Several manufacturers produced Exciter/enhancer stompboxes; Aphex, Boss, Behringer... butthey seem to have ceased now. Only BBE with their Sonic Stomp seem to be pursuing that; they use a different principle, though.
Back in the early days of Aurel Exciters, I would try to tune in my FM radio better when I heard the distorted vocals.
I have the boss stompbox, I didn't knew about it and saw it in a shop, ask to try it out, boring amp (peavey transamp IIRC),
boring guitar (low end Cort strat). It changed the clean sound from night to day, I took it home with me. In my setup was much less impressive but still quite useful to have in the floor, quite a few friends tried to stole it from me and I think someone succeed, I haven't seen it in a while. For the BBE there was a single chip solution, a Chinese seller had them who sells the wavefront converters, vactrols, and other sort of obsolete audio related components. I can't remember the name, but someone here will.JS
I may be a little biased because I know the guys who developed the Peavey transtube technology (solid state tube mimic). ("transamp" was Paul Buffs transformerless mic preamp module). The transamp was a respectable mic preamp technology for several decades ago. The year the transtube guitar amp was introduced at NAMM they did a single blind demo A/B switch comparing it to a real tube amp (a Peavey classic I think). The vast majority could not reliably tell them apart. JR
Chaps! So got the saturation bit of the circuit to simulate well on ltspice, thanks for the help! I'm now looking into the EQ section. Any suggestions how to efficiently strip this circuit to only having the 40kHz boost with a pot + the whole bandwidth signal at the output? I can't seem to figure out how to achieve this, a bit confused about what I need to keep and what not! As before, any pointers, ideas and replies welcome Cheers
Well... some of the circuit blocks make sense, while others do not The hot input has a 1M resistor and a cap, while the cold input does not. Why not? Also, the hot, which is typically considered the positive polarity, goes the the inverting input?You have swapped the +/- opamp inputs on the sallen-key highpass filters.After you mix the dry and saturated signals, you have 10k/47u/1M... I can't see any reason for having those components there.Suddenly, you make the signal (impedance) balanced with 47 ohms and run it to another differential amp to make it single ended again. Why? Is that balanced connection a looooooooong stretch of cable? BTW. the +/- opamp inputs are swapped again here, and it's also wrong for the two last opamps.I can't figure out how the 40 kHz EQ is supposed to work (it probably doesn't) and loading that poor upper opamp with 200+20 ohms isn't a good idea either.To easily balance the output, do like you did after the virtual earth mixer. Add 47 ohms (or a bit more) in series with the output and use that as the hot output, then add another 47 ohms (connected to ground) and 10 uF cap in series as the cold output.