newb - PSU questions

MIDIbox SID
1

Hi !

My Core module is up and running - the power is fed from an RJ14 connector (phone), and works well, and looks cool.

I have finished my SID module too, but the OPSU looks way over my head to construct.

Here are my questions -

  1. I have a C64 psu ready to be cannibalised, but it’s 220V and I live in Canada.

  2. It has only 4 pins ! how do i test which one is outputing what?

  3. If I want to use 2 power supplies (one for core one for SID) will there be huge problems with noise?

  4. How can I just test to see if the SID module I just finished is working, without the OPSU?

And finally - what would be the simplest way to connect the ONE rotary encoder I have to the Core? I have to build a DINX module, is that it?

Thanks so much, this is a wonderful community of funny guys (and girls??)

pc

pk

2

  1. you need an own C64 psu for your mains voltage in your country!.. don’t use that european 220V!!

  2. the bottom pin should be ground, all the other like in description here:

http://www.c64-wiki.de/index.php/Netzbuchse (german) - but get sure -> take a measuremeter and check Voltage of pins between ground. but do it with a steady hand. test it only with an “canadian PSU”.

  1. it’s best solution to use the optimized PSU schematic with one psu.

  2. best you connect the few parts of C64 optimized psu schematic and connect core to sid board. then check the voltage at IC, without stuffing SIDs.

  3. yes you need a DINX. Connect one rotary encoder and connect ground like in description of DINX.

Scroll down this site. At bottom you find all necessary documents: http://www.ucapps.de/midibox_sid_manual_hw.html

i hope it helps… Greets rio.

3

Being a newbee myself and having just finished the optimized PSU I can say that it is simpler than it first looks.

The schematics look big and scary at first but if you break it down to two power rails of 5V and 9V it becomes a bit easier.

I have 2 C64 transformers, one has only 4pins and one has 7. I measured their voltages and it matched the information in the german C64 wiki.

Looking at this exellent little guide togeather with the schematic pdf makes it easier as well.

http://www.danielprice.org.uk/synth-diy/sid_2.htm

The hardest part for me was actually to desolder the switch and PSU connector from the C64 mainbord  ;D

/Cheers

//Peter

4

The hardest part for me was actually to desolder the switch and PSU connector from the C64 mainbord

yes thats a fact!  I havn’t bought a 7-pin port and have used a desoldering iron for a damaged C64 board… Oh man it spends a much off time to do that…

.., one has only 4pins …

the pins are fixed at correct position… so they matched in 7-pin port too..

greets, Rio.

5

If you hold off for a short while, maybe the right switch will become available and you can save yourself the trouble of desoldering it and of killing a c64 :slight_smile:

6

I also need help with a PSU question but I also have two things to offer. Can I still use the optimized psu with a single sid solution? Still doing exactly was it say i.e. remove IC3 from the core?

You can order the same switch from digikey. It’s from NKK Switches. Visit there site and figure out the solution that will work best for your midibox SID. The one i’ll be using is the M2022TXG41-DA-RO. Here are the links. http://dkc3.digikey.com/PDF/T073/1873-1874.pdf and http://www.nkkswitches.com/pdf/M2rockers.pdf.

Also the PSU connector is just your old fashioned DIN 7 pin. Which can be also ordered from digikey. http://parts.digikey.com/1/parts/264966-conn-din-7-pin-female-pcb-sds70j.html.

7

Nevermind read the walkthrough closly again. I can use this for one SID. Enjoy the switches ;). Oh I am also blogging about my progress for anyone who wants to take a look. www.frishkorn.net.

8

Problem solved :slight_smile:

You should blog here/the wiki! External documentation tends to go bye-bye after a time :frowning: