I don't remember that one at all. I imagine instead of building one yourself, you could always pick up something like this instead:
https://www.parts-express.com/Rolls-SL33b-Mini-Stereo-Program-Limiter-w-RCA-3.5mm-In-Out-245-1176

Price is right. I'm not sure how the quality would stack up against a DiY version.

You could also pick up a used DSP from eBay and hook everything up through that. It may have a better set of hardware inside of it.

eBay also has a ton of models which may be worth at least researching as there are a ton which are well under 100 bucks. I've never used them myself.