Simulation of NLC sloth with LTSpice

Hello folks,

today I want to continue the series about simulation of synth modules with LTspice.

We want to analyze the sloth module from NLC.

Lets start with the schematic:

Sloth schematic

Right below is a copy of the schematic, created in ltspice, however missing the potentiometer(s).

Sloth Simulation

Whats important here to note here is that for the fourth op-amp we needed to add some voltage offset of 1 µV to get it working. Additionally to that we need to simulation the power-on cycle of the power supply, by adding the Voltage with PieceWiseLinear function given ze values (t0,v0, t1, t2 ) with the Values 1ms 0V 100ms 12V ..

Here are the files to tinker with

But thats it for now - see you in another blog post.

Last update: May 8, 2025