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.
(http://www.dazatronyx.com/forums_etc/buffer-amp-pcb.png)
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 :icon_cool:
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? :D
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
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
i don't know how it sounds, but it certainly LOOKS cool!