I'd stick a single JFET buffer circuit on a piece of perfboard and try it out. Install a switching jack in the guitar to cut power when it's not in use.
Re: Small questions that don't fit anywhere
2271Re: Small questions that don't fit anywhere
2272i've been meaning to get round to something like this for a long time, since i know very little about applied audio electronics or circuit design, and a straightforward preamp/buffer seems like a good place to begin. i landed on don tillman's preamp design (after being really impressed by his notes on guitar pickup characteristics), but i don't quite know where to go next as far as identifying a viable modern substitute for the JFET part, which i don't think is in production anymore.
Re: Small questions that don't fit anywhere
2273J201 FETs are still readily available and used all the time in pedals. You could also sub something like MPF102 or 2SK30, just watch the pinouts.dfglv wrote: Mon Feb 10, 2025 5:37 pmi've been meaning to get round to something like this for a long time, since i know very little about applied audio electronics or circuit design, and a straightforward preamp/buffer seems like a good place to begin. i landed on don tillman's preamp design (after being really impressed by his notes on guitar pickup characteristics), but i don't quite know where to go next as far as identifying a viable modern substitute for the JFET part, which i don't think is in production anymore.
Re: Small questions that don't fit anywhere
2274ah terrific, thank you! i'd prematurely given up after being unable to find any at the first two part suppliers i checked (farnell, RS, both UK)Nate Dort wrote: Mon Feb 10, 2025 7:09 pm J201 FETs are still readily available and used all the time in pedals. You could also sub something like MPF102 or 2SK30, just watch the pinouts.
Re: Small questions that don't fit anywhere
2275I was under the impression that thru-hole J201 were becoming very hard to find, but surface mount versions are still plentiful.
If there are good sources of the thru-hole package J201, please let me know.
I guess that I could also just check mouser and parts express myself
If there are good sources of the thru-hole package J201, please let me know.
I guess that I could also just check mouser and parts express myself
Re: Small questions that don't fit anywhere
2276Try 2N5458benadrian wrote: Tue Feb 11, 2025 11:26 am I was under the impression that thru-hole J201 were becoming very hard to find, but surface mount versions are still plentiful.
If there are good sources of the thru-hole package J201, please let me know.
I guess that I could also just check mouser and parts express myself
Re: Small questions that don't fit anywhere
2277Looks like I have 8 J201s if anyone needs one or two
Re: Small questions that don't fit anywhere
2278I used to buy like 100 packs of them on Ebay for around $20.
Edit: yeah, seem to still be a ton on there.
Re: Small questions that don't fit anywhere
2279There's a few hundred at Mouser: https://www.mouser.com/ProductDetail/In ... teMw%3D%3D
Re: Small questions that don't fit anywhere
2280If you're building a simple buffer I don't think the JFET type really matters at all. Any n-channel should work.
I've made tillman-ish preamps with LND150 dep-FETs and they've sounded aok.
I've made tillman-ish preamps with LND150 dep-FETs and they've sounded aok.