| PatPet |
Special thanks to Klaus who helped me a lot throughout the DIY work. It' had been painful to figure out the bug that I carelessly made by misreading the resistance of 22.1ohms and 33.2ohms as 221ohms and 332ohms respectively. He simply gave me a hand that took me out of serious troubles.
The following picture shows the main pcb |
|
|
| PatPet |
| The whole thing with the chasis opened |
|
|
| PatPet |
| Front view at a different angle |
|
|
| kilowattski |
| Very nice job! I see you also have the mandatory Blue LED also.;) |
|
|
| PatPet |
Thanks kilowattski . The Blue Led act as constant voltage source as part of the power regulator, which will be used for DAC upgrade later on.
Power supply section: |
|
|
| PatPet |
| The stepped attenuator |
|
|
| PatPet |
Grounding schematic
I got very very little hiss noise when the volume is set at the last few greatest volume.
The gain resistor used is 316ohms. |
|
|
| PatPet |
| Input selector diagram |
|
|
| PatPet |
The PSU cap 1000uF/100V are replaced by 2 2200uF/63V in series as I could not find a cap of such rating.
Totally I used 16 2200/63V caps in both power supplies. |
|
|
| Duck-Twacy |
Damn, your AlpehP, like the one from Kilowattski, is just awsome.
Nice PCBs, where are they from? did I miss a groupbuy? |
|
|
| Bricolo |
I don't even want to know how much you spend on resistors :hot:
Impressive work (both of you ;)) |
|
|
| PatPet |
Bricolo,
Thank you
I think I've invested more on the caps instead of resistors.:cool:
Actually the attenuator is bought from Taiwan. It costs me around $40USD. |
|
|
| PatPet |
| The gounding schematic again. Posted the wrong one just now |
|
|
| Bricolo |
| quote: | Originally posted by PatPet
Bricolo,
Thank you
I think I've invested more on the caps instead of resistors.:cool:
Actually the attenuator is bought from Taiwan. It costs me around $40USD. |
This is a good price
Are the resistors 0.1% dales? I paid more than 0.5$ for one! |
|
|
| eLarson |
| quote: | Originally posted by PatPet
The Blue Led act as constant voltage source as part of the power regulator... |
Out of curiosity, what is the voltage across the blue LED? I've never used one, but I found some in rather, er, minimal packaging at a local electronics shop. Other than stating that it would produce 10 mcd illumination at 20 mA bias, there was zero information about it. |
|
|
| Bricolo |
| I think it's about 2 volts |
|
|
| PatPet |
Bricolo ,
They are RN60D resistors. So I think they are not 0.1% ones.
The whole volume control unassembled is sold at NT$1280. In the kit there are 184 resistors. So you might calculate how much each one of them costs approximately.
eLarson,
I measured 3.5V across the LED. |
|
|
| seve |
Very good looking preamp. I really like this "simple" and "clean" build chasis. I hope it sounds as good as it looks. Before you decided on the the Aleph P did you then try the BOSOZ or X-BOSOZ if so please compare them!?
| quote: | Originally posted by PatPet
The whole volume control unassembled is sold at NT$1280. In the kit there are 184 resistors.
|
This volume control is the one I have been looking for did you buy it at diyzone? If so do you know if they will sell to Europe and if so how to contact them as I don't understand the language at the page!?
.....once again great looking preamp!
Martin |
|
|
|
