Versatile and comfortable passive pre-amp

[redjr]

They've been in the plastic bags since I got them over a year ago. Hum... I'll check the other one. They move anything but freely.

I rechecked them and while they are very stiff, they do rotate.

 

[anjump123]

I hope you are going to do a kit for the new design, as I've recently found this thread!

 

[atupi]

I rechecked them and while they are very stiff, they do rotate.

If You are not using a know can seem a bit hard to rotate. Also the grease become harder in time If not Used. I think yout pot is ok.

 

[redjr]

If You are not using a know can seem a bit hard to rotate. Also the grease become harder in time If not Used. I think yout pot is ok.

I'm sure they are fine. I'm about ready to hook it up to the VCPre and check it out. I was planning on putting a big knob on it anyway for manual control. They'll probably loosen up with time too.

 

[Rudi_Ratlos]

@ANJUMP123:

whilst METAL is busy programming the firmware for the digital-potentiometer MCP42100 being followed by a VCCS, I myself am layouting this passive RPRE_V2 (see attached image).

Let me once more summarize the capabilities of this small (100x100mm) PCB:

- Source selection (between 4 music-sources)
- LDR - based attenuation
- MUTE - function
- Temperature display
- Interface to Soft-Power-On / Mains-DC filter PCB (thereby switching on/off your amplifier)
- Every function can be done / will be displayed by a Remote Control Facility / LCD

Is there any function missing?

METAL and I know one another for a couple of years.
Together: we are a very strong DIY - team.


Best regards - Rudi_Ratlos

P.S.: I will need to do a couple of "cosmetic" changes to the layout, of course.
P.P.S.: My personal impression is: "Software" (like the one to implement the MCP42100) will play a major role in future, and it is best to get used to it right now.

 

[metal]

I also finished writing/simulating hardware-based SPI module code that I finished today, tomorrow will get back to the veroboard I showed earlier and start the real hardware test. Can't wait to see the LEDs glowing!

 

[apnneto]

This is exactly what I need ...

 

[anjump123]

No, That seems perfect!

 

[rbalu72]

Just found this thread and thought of checking...

Will there be a group buy for the new version for PCBs and Kits separate or combined? How much does it cost? I am interested to have one kit if its suits my budget.

 

[metal]

I did a quick test yesterday, it worked on the first run!
I am attaching a small demo video that shows each side dimming and glowing really nice to watch when lights are off

 

[Rudi_Ratlos]

I have ordered 10 of the RPRE_V2 - PCBs (as shown in post #785) today.
The size of the PCB is 100x100mm.

I won't do a "big group-buy" this time, but will offer some "spare" PCBs and some of the needed parts in a "small group-buy".

Have a look at image 1.
I will keep 3 PCBs for myself, METAL will have 2.
So: there a 5 PCBs left that I want to offer.

The "small group-buy" will include:

- the RPRE_V2 - PCB; the price will be 7€
- a pre-programmed PIC µProcessor; the price will be 5€
- an Infrared Remote Control Unit, brand: SEKI-Grande; the price will be 13€
(if you already have a programmable IRC, I will tell you the system-address and command code, to which the µP's firmware is responding)
- a quad of well matched LDRs (I do not yet know, if I will match them myself or take an approriate offer)

The EXCEL-sheet shows APNNETO and ANJUMP123 having interest.
Please confirm!
So there are 3 PCBs left.

About the time-schedule:

I ordered the PCBs today, meaning that I will have them in about 3-4 weeks.
I will send 2 PCBs to METAL immediately.
Then METAL and I will begin to solder the PCB and implement and test the firmware.
After a thorough check of the firmware I will program the µPs.
So it will take about 7-8 weeks, until I will send you the ordered parts.

If you are interested (if you want to know more about the capabilities of the RPre-V2): tell me.

Best regards - Rudi_Ratlos

 

[Fabian85]

Hi Rudi,

again a nice layout. Add me for a PCB, PIC and, if at reasonable price, a matched LDR Quad.

Regards,

Fabian

 

[hallodeletue]

Hello Rudi,

please add me for a complete package as well (PCB, PIC and matched LDRs).

Best regards,

hallodeletue

 

[ipolyakov]

Hello Rudi,

Please add my name for one PCB and all parts including matched LDRs.

Thank you in advance,

Igor

 

[redjr]

Hi Rudi,

Looks like spoke to late to get a board and parts for this first run of the RPRE_V2. Add me to the list for 2 x (PCB and parts) of the next GB.

Thanks, Rick

 

[apnneto]

And one for me next time.

 

[Andreas B]

Please add me for 3 sets of PIC,PCB and matched Silonex
Regards
Andreas

 

[apnneto]

And one for me next time.

Just to confirm one now and one more next time... i need two ...

 

[Rudi_Ratlos]

Gentlemen, all of the 10 PCBs that I have ordered are assigned (see attached image 1).
Please do not ask me anymore.

Rick: this PRE will be the perfect mate for your "BlackBeauty - SYMASYM" (see attached image 2 of my own SYMASYM).
The shown PRE (the current version) uses a motorized potentiometer.
The new, offered version will replace it by a digitally controlled potentiometer.

Best regards - Rudi_Ratlos

 

[rbalu72]

Hi Rudi,

Looks like am late, if you can accommodate in current run, kindly add me for a complete package as well (PCB, PIC, Remote and matched LDRs)

Thank you,