{"type":"firestarter.listing","listing":{"id":"lst_ivKjSYFg","product_name":"Knight School Synth (Built Pedal)","category":"Effects","description":"\n NOT A DIY KIT. THIS IS A FULLY BUILT PEDAL. \n\nHere’s a tale from the annals of my personal DIY history: I learned how to breadboard and read schematics right before college, and I breadboarded many designs posted on ampage.org. Shortly after that, I found a new DIY website. This one was called Beavis Audio. If you’re familiar with this, it’s for a good reason; BA was one of the premier DIY sites out there, and it refreshingly wrote everything in plain English. One of the projects there was called the “Heterodyne Peyote Space Explorer”. This introduced me to the CD40106 chip and I played around with that device for what seemed like double-digit hours when I was taking EE classes. \nOne thing I stumbled across was when I combined a boost circuit I was working on with the 40106. It made an oddball noise, but one I thought could be cool with some refinement. It took a lot of tinkering, but it worked much better when I put a second boost circuit in front of it. I couldn’t really explain why, but it sounded cool, and I built a couple for my friends. Some time later, I stumbled across a webpage authored by one Tim Escobedo. There’s a ton of good info on his “Circuit Snippets” page, and it still exists today. As it turns out, Mr. Escobedo discovered a form of this circuit back in 2002, and comparing his circuit analysis with mine and the Space Explorer was a real “Eureka” moment for me. \nOur Knight School Synth is our most ambitious project to date. I’ve since leaned into Mr. Escobedo’s method for producing the pre-gain, as it’s simpler and uses far fewer parts than my original. Essentially, it turns your guitar signal into a square wave, and then uses the CD40106 to vary the pulse width of that square wave. There’s also a switchable LFO, which automatically varies the pulse width for you, along with a Depth control to change the intensity of the shaping. It’s a truly cool effect that emulates the monophonic synthesizers of yesteryear. Dare I say there’s not a lot on the m","images":["https://cdn.shopify.com/s/files/1/0370/1873/0628/files/Synth-Shopify-01-min.png?v=1707554169"],"price":134.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T16:26:04.165Z"},"share_url":"https://firestarter.network/l/lst_ivKjSYFg","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer <your Firestarter API key>","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_ivKjSYFg' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Knight School Synth (Built Pedal)' and a budget_max comfortably above $134.99 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}