Solid State Preamp for CV/BV/BCV etc.

[tpappano]

Did a couple of trace cuts, added a couple of parts, the little preamp I did for the BC now nicely handles the vibrato models 8) I should have pretty boards next week!

[Drawbar Dave]

Did a couple of trace cuts, added a couple of parts, the little preamp I did for the BC now nicely handles the vibrato models 8) I should have pretty boards next week!

I salute you sir 😀

[tpappano]

Thanks, Dave! You and Patrick might have to become beta testers 8)

[enor]

Ooo! Feature request: If you add an extra line level input point post scanner (for connecting a TREK percussion kit or similar) you would have a total winner there! Vibratoless percussion tone without extensive modifications...

[tpappano]

Thanks enor, that could easily be done. I'm actually planning one that would include percussion, too. It will have to be slightly larger 8)

[tpappano]

Forgot the picture!

[enor]

If you do either one - with full perc, or with perc input - sign me up for one! Would be perfect in my AV.

[skydawg]

Tom,did you start with a bare board and install all those components?How the heck did you learn to do all that?

[tpappano]

I used circuit board 'layout' software to design the board, then a 'quick turn' fab company makes the actual circuit board, then I put all the parts on. Once you have a design, you can have boards in your hands in four days! It is fast and easy these days. Not all that long ago, doing a layout was slow and tedious and fab companies took about 6 weeks to make a board. I used to prove a design by building it on "perf-board" using parts with leads and gobs of little wires connecting everything together. Very time consuming, I quit doing that about 20 years ago, now I just go straight to pc boards because it is fast and economical 8) To build a lot of something, I have robots 8) Electronics has always been a passion, starting at about age 5. I'm lucky to have made a living getting paid to perform my hobby. FWIW, I use "expresspcb.com" for my prototypes and their design software is free and *very* easy to use.

[tpappano]

The version 2 prototype works great. Extra outputs for driving Leslie and Hammond tone cabinet combinations and accepts 120V or 240V power. This board went to the fab house before Enor mentioned needing the percussion input, but the next one will have it 8)
Having problem uploading pic, will try later...

[tpappano]

Trying the picture again...
I'm getting "internal server error" (?)

[tpappano]

It worked!

[Drawbar Dave]

Fantastic! The first SMD Hammond preamp!

[Sweet Pete]

I've been using a Lounsberry Tall and Fat for almost two years.The Lounsberry Organ Grinder for two years.Just took delivery of the Tall Fat and Wide.Best sounding preamp from right off a matching transformer I've heard.

[tpappano]

Thanks, Dave! I suppose you're right about the smds 8) I guess there probably aren't any other smd motor drives in 64 year old Leslies either, lol!

[Drawbar Dave]

Do you add the SMD components yourself Tom or is that part of the board manufacturer's service?

[enor]

Looks fantastic! Waiting eagerly for the next version then! ;)

[tpappano]

Hello Enor, thank you! I think I have a percussion input figured out, I can move the filter cap to the left and add a couple terminals to the block on the bottom. Won't be long 8)

Hi Dave, I built these prototypes with tweezers and a soldering iron 8) If I'm going to do more I'll program the robots to do it! They would do this little board in about 3 minutes 8)