I will try to reduce the dimensions of the board. I will replace the relays with AQW612S to reduce the overall power (µC had brown mode). Perhaps smaller SMD components?  

Schematics and PCB of the T-REG tube voltage regulator from Linear audio.   HV rectifier and CRC filtering not included. Perhaps I will modify the PCB? 10µF + TO220 resistor + 47µF (EPCOS MKP DC LINK capacitors).        

... finished!          

The grey outlined parts on the BOT; the brown outlined on the TOP. Heatsink should be a big custom one (simple alu bloc) thermally contacted to the metal cover of the case (Hammond or other).   Low cost version: first start with the PCB. WIMA or any cheap MKT/MKP RM7,5mm. Electrolyt...

I found a constant current source for 0,335€ in SOT353 package: +75VDC max@50mA max only only Rset resistor, the NXP PSSI2021SAY.   What do you think about this component?

sorry Wakabi!   For all the other: - I will connect only +60VDC (text in red) and not the max. possible plate voltage of the 1AD4 for the desired voltage swing of 32V and a constant current of 1mA: for Wakabi, + at X111-1 and - at X111-2, - therefore I need only 2 LT3092: N111 ist NE Not...

I´m working on tube test equipement for everybody who like to build audio amps and hate the smell of solder!   I will start with the standard socket boards. Following CCS board. Working on a simple universal high voltage supply and an universal heather voltage supply.    

Do you have try the LT3092?   The BUF634 can also be replaced by transistors (see TubeCAD article and other stuff on the web).   I will try the LT3092 to build my own opinion.   I´m working on a small portable LiFePO4 power solution with an acceptable running time: 3 different...

Working on my version of the Pimeta...  

First, write the requirements down: an important point is the battery chemistry, the needed voltages and the overall power requirements.   A simple functional diagram (VISIO) will help by brain storming. Then post this one and ask for comments.   Personnaly, I don´t like MAXIM, I´m very...

    I need comments before starting layout, thanks.

+5VDC and +3,3VDC from standard COTS laptop supply (+9VDC to +18VDC). Design fully tested!   LiFePO4 Battery (HY2112 is BMS) + USB-Charger + PowerPath (for +3,3VSTDB). Fully tested!

... and with two SSD not larger than a 5,25" drive. Active dissipation, IP65 enclosure (externally mounted fans), military project. the routing of USB 3.0, DVI, HDMI, LAN, PCIe was a little bit difficult with Eagle but successfull. You can do a lot of things with these tool, see Eagle 3D... .

I am starting the schematics with the 1AD4: +60VDC with 1mA CCS (LT3092) for 2Vpp/32Vpp.   More coming soon...   Any suggestions or comments?  

Eagle is a very simple tool! You need only a good biblio. COMe i7 Mainboard.

Charger Microchip MCP73223 for 2S LiFePO4. Overcharging protection included! With LMZ you become the UV protection. Le tour est joué! Ok, MCP is DFN package, manuel soldering impossible!  

        Finally!

thanks Ludoo! Bizarre, my problem with the "insert image" icon is solve?!   Hammond 1444-24CWW chassis.   TKD CP-2500 or ALPS RK27112.   MKS4, Mundorf MCAP or ZN coupling capacitors.   The output capacitors are MKS4 220µF/50VDC/30VAC from WIMA, or electrolyt capacitor.   Iset...

Why not 2S LiFePO4 battery pack (down to +4VDC, high current capability and very fast 10C charging) and an LDO regulator? Switching needs filtering!   TI LMZ12001 for +4.5VDC<VIN<+20VDC and the RON functionality to preserve the batteries from deep discharge.   And do you think about the...

nothing to see! Lets try jpeg...  

I hope its successfull? ALT COPY and CTRL V! Schematics and Layout for new PCB.  

I hope its successfull? ALT COPY and CTRL V! Schematics and Layout for new PCB.  

Yeah! But not really good for the schematics! (image missing)  

Hi, two questions: what is the max. output power for 32R and 300R headphones? Thanks  

Ok, learning by doing.   Ordering parts, soldering, measuring and listening...