Buffer / Boost PCB. Please check it out for me? Fat-hand-drawn-traces style.

[darron]

I've had an annoying circuit sitting on my breadboard for ages now that I don't want to remove since it'd be a pain to setup again, so I decided to design a circuit in theory on the computer, so that I didn't need my breadboard.

It's just a simple buffer/booster pedal. The idea wasn't to add magic sparkle etc., I wanted something that was as Hi-Fi as possible - hence the OPA134 opamp instead of a mosfet or cool GE.

I drew up the circuit in flash, as usual. Then I started filling in gaps, and it began looking like an old 60's-70's design. Any tips on how I can keep that sort of theme going? Haven't worked out what to do with the big empty gap at the bottom yet. There's a gap in the middle to allow for the jacks.


Since it's really simple, I was hoping that somebody could comment on the circuit? Any suggestions would be greatly recommended as I haven't even built it. It should be simple enough to follow without a schematic.





if i get told that it should be good, then i'd be happy to post a 'ready to transfer' version in pdf for anyone who wants to give it a shot.

thanks guys. cool bananas 

[rock_god_dan]

Looks good! One question though, isn't the .33uF in the feedback loop a bit small? Wouldn't it cut some bass?

I'm definitely no expert, but I've noticed that all the opamp booster schematics I've seen has a cap to ground in the feedback loop, but the opamp tutorials i've read don't have any caps. I definitely don't get this. That shows my "noob"-ness huh?

Have you breadboarded this? I would definitely like to give this a try, as I find that my microamp isn't as flat as I expected it to be.

dan

[darron]

hey thanks for the response dan! this was posted ages ago any nobody commented on it. you may very well be right about the feedback cap. i chose that value because it's the largest greencap you can get without getting really large high voltage stuff. i thought that most people just used a massive polarised cap as they do at the end as a coupler. and you're not a noob, you picked up one something for me!

yeah... i made this as a dual opamp booster, and you were right, as you boosted it did seem to cut some bass out. otherwise okay. i'll have to try replacing the caps in the one i made with something massive, maybe running parallel with the greeny? the truth is i don't know how it actually works, but i know that you need the cap there lol.


thank you very much. i was wondering why it had a treble boost effect!

otherwise i can make the necessary mods for the cap and release a ready to transfer pdf or something if you'd like. unconfirmed though, but it looks simple enough.

thanks again!

darron

[rnfr]

i don't know how it sounds, but it certainly LOOKS cool!