aviel

looking for recommendations: preamp a perfboard
« on: November 06, 2018, 09:30:11 AM »
Hey,
i just completed my DIY 500 lunchbox, equipped with a diyre cp5. looking to add another one to the the arsenal.
i am looking for something that i can build on my own (perfboard, since i am not int etching yet), do you have any recommendations? something "colored" can be nice.


Re: looking for recommendations: preamp a perfboard
« Reply #1 on: November 06, 2018, 03:32:24 PM »
My advice is the Hamptone JFET Preamp aka Fetboy. Easy to build,  tons of colour as micpre and DI for instruments.

aviel

Re: looking for recommendations: preamp a perfboard
« Reply #2 on: November 06, 2018, 05:28:22 PM »
Thanks! Will have a look on this forum i assume there should be plenty of info? Did you build one?

Re: looking for recommendations: preamp a perfboard
« Reply #3 on: November 06, 2018, 05:47:17 PM »
Yes, you will find everything you need here in the forum and yes, I have build some of them.

aviel

Re: looking for recommendations: preamp a perfboard
« Reply #4 on: November 08, 2018, 06:48:15 PM »
Another thing is, i would like to use it with my current psu in the lunchbox. I have +-16, i assume i could convert it to a dual rail supply, what do you think?

Re: looking for recommendations: preamp a perfboard
« Reply #5 on: November 08, 2018, 10:02:02 PM »
You do not need a dual rail psu for the fetboy, it will work with a  16V single rail supply. 24V would be better though.  You asking for colour, the low voltage will give you more of them. 8)

Just build it up, only a few components a needed. You can start without the transformer, just use it as a DI box, then you can extend it with a cheap 1:5 to 1:10 input transformer and you will get everything you want.

It is a perfect project to build it up on perfboard, the result could be great in my opinion. The only challenge is to work with FETs, the need a lot of adjusting or selecting.

Have fun!
« Last Edit: November 09, 2018, 01:51:12 AM by rock soderstrom »

aviel

Re: looking for recommendations: preamp a perfboard
« Reply #6 on: November 09, 2018, 02:31:40 AM »
Awesome!
one thing though,
must of the links are offline, do you have some on your side that you might share? pictures/diagram/sound samples/ anything?

Thanks! ;D

Re: looking for recommendations: preamp a perfboard
« Reply #7 on: November 09, 2018, 04:42:20 AM »
Awesome!
one thing though,
must of the links are offline, do you have some on your side that you might share? pictures/diagram/sound samples/ anything?

Thanks! ;D

I know it is a bit PIA but it is all there. Check the several threads here in the forum, you will find a lot of useable infomation.

aviel

Re: looking for recommendations: preamp a perfboard
« Reply #8 on: November 13, 2018, 01:15:51 AM »
got it,
i am still thinking if i should i convert it to dual rail supply. +-16.
what psu did you use? just a regulated wallwart?

Re: looking for recommendations: preamp a perfboard
« Reply #9 on: November 13, 2018, 05:19:50 AM »
I have done it with a LM317 based PSU and it works with a unregulated wallwart, aswell. Null problemo! There is no need to convert it to a bipolar PSU, but its DIY you can do it that way if you want to.


aviel

Re: looking for recommendations: preamp a perfboard
« Reply #10 on: November 13, 2018, 06:14:41 AM »
the only reason i wanted to convert is to use it with the PSU i already have, which is +-16v for diyre CP5 preamp. i am assuming that 16V  supply only will reduce the headroom drastically.

Re: looking for recommendations: preamp a perfboard
« Reply #11 on: November 13, 2018, 08:10:23 AM »
AFAIK, +-16V = 32V with a floating earth. You can use that or regulate it down to 24V with a LM7824 or LM317. I have never done this before, but it should work, right?

I would start with a test setup based on the +16V rail, just to see if the headroom is sufficient for your application. My bass DI operates with 18V and I really like it.

aviel

Re: looking for recommendations: preamp a perfboard
« Reply #12 on: November 13, 2018, 08:19:02 AM »
Im not sure about converting it, the PSU earth is grounded to the chasis and to the wall, so i wouldn't say it is floating. the audio grnd is also grounded to the chasis, i am not sure if it iwll work.

Re: looking for recommendations: preamp a perfboard
« Reply #13 on: November 13, 2018, 08:30:40 AM »
My idea was to isolate the ground of the fetboy from chasis and PSU ground so that the Fetboy is floating. But I am not sure if it works.

Again: "I would start with a test setup based on the +16V rail, just to see if the headroom is sufficient for your application. My bass DI operates with 18V and I really like it."  ;)

aviel

Re: looking for recommendations: preamp a perfboard
« Reply #14 on: November 13, 2018, 09:03:30 AM »
yes, i will definitely try it first with 16 Vdc. will also add a input transfomer for mic input


 

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