Mezmerize DCB1 Building Thread

[johnwmclean]

Rush you have a pm.

[Jaap]

Originally Posted by Rush

I missed this GB. Does anyone have one Mezmerize DCB1 board they would be willing to sell?

Thanks,
Rush

I have a (almost) completely populated board for sale.
Transistors and Alps are not yet soldered in.

[komigenie]

Originally Posted by Rush

I missed this GB. Does anyone have one Mezmerize DCB1 board they would be willing to sell?

Thanks,
Rush

I got one for ya, i am in germany @ the moment - will be in bradenton on vacation in 10 days or something - if you still ned a PCB ...

[Rush]

Thank you so much for the responses.
I have found a board, bought and paid for it.
I know others are looking too, so thank you for sharing your bounty.

Rush

[komigenie]

Originally Posted by Rush

Thank you so much for the responses.
I have found a board, bought and paid for it.
I know others are looking too, so thank you for sharing your bounty.

Rush

NP, i am prolly going to build one more for me .. :-)

[pwalker]

I am looking for a Mezmerize DCB1 Board as well. If you have one that you would be willing to sell, please PM me.

Regards,
Paul

[komigenie]

Originally Posted by pwalker

I am looking for a Mezmerize DCB1 Board as well. If you have one that you would be willing to sell, please PM me.

Regards,
Paul

Nah, i am gonna keep it ... I have all relays soldered, and i got me all PRP resitors in hands, caps too .. just need matched transistors to complete that one ...

Sorry ...

I just finish my DC-B1, and for a moment i was about to get rid of Mezmerize, but i change my mind

[pwalker]

Thank you for your response. If anyone else has a Mezmerize DCB1 they would be willing to sell, please PM me.

Regards,
Paul

[Salas]

I authorized the Mez to the diyA Store. So it will hopefully remain an available option for the future.

[orpheus]

Try as I might, I can't get the Mezmerize I built to output the correct voltage. On the positive leg, I get about 9, and on the negative, around 7. The 2nd set of LED's on the negative leg are usually not lit, but they do occasionally light up. I have also had it with the positive leg at around 10 and the negative around 9, but that doesn't last very long before it fades back to around 9+ and 7-. I have changed the 5 LED string, and tested and resoldered all the connections, checked the board traces against an empty board, and checked and quintuple checked all the part orientations and resistor values.

The part that really disturbs me is that it will very occasionally work correctly, and this always coincides with the neg leg 5 LED's lighting up. I have changed out the LED strings on the negative side, and I have swapped the 2sk170's on the negative side (since I have a bunch of those on hand). Neither had an effect.

I am using a 12 volt transformer.

Here are some voltages:

output from Diodes: 11+, 9.9-
Across R1: .7+, 1.2-
Across first LED set: 5.57+, 5.57-
Output from first LED set: 5.4+, 4.4-
Input 2nd LED set: 9.1+, 7.15-
Across 2nd LED set: 9.67+, 7.8-
Output 2nd LED set: 0.3-, 0.3-

I did match the LED's to get around 1.8 volts from each one. When I switched the LED"s in the negative leg, I grouped them to measure as close to 9 and 5.4 volts as I could. All 5 of the vref LED's together were measuring around 9.1 with a 2SK170 used to power them through a battery.

If I could take any more measurements, please let me know. I have been trying to fix this for hours now, and I haven't been able to figure out what is wrong. If anyone has any ideas or suggestions, I would very much appreciate help.

Thank you for your time.
Aaron.