First post, by Ozzuneoj
I have an assortment of sound modules I've collected over the last 7 years, and I'm in the process of getting my "stack" put back together and hooked up properly. I haven't had them all hooked up in a while.
I have enough power supplies to power the modules I will be putting in my stack, but what I've got is an assortment of original Roland adapters from the early to mid 90s and some generic new ebay\amazon replacements (all center negative, 9v DC). I have never had any trouble with them, and I'm fairly certain I have even run some of the higher power modules with the 9.6v 200MA "Boss" brick that I received with an SC-7 a while back... though I don't recommend that if you can get something else.
Something I have noticed though is that if I use a DMM and check the voltages on my power adapters the old Roland ones all read very high, where as the new ones are all within maybe .5v of their rating. For example, I have a Roland ACK-120, which is rated for 1300MA at 9.5v. When I check the output (not plugged into a device), it shows a whopping 16.68v. I can't find any posts of mine that covered this but I recall being told that this is intentional and that voltage will drop to it's rated value once there is a load on it, but... that's a foggy memory, and as time goes on I'm more concerned about frying these things. I feel like this is just flawed testing on my part since there is no load, but I want to be sure.
It is also worth noting that my MT-200 (SC55 with a floppy drive basically) recommends a 9v 1200MA adapter and it says ACB or ACK only... and my ACK adapter is clearly marked 9.5v 1300MA, so at the very least, that should be perfectly safe to use. I think that was the adapter that actually came with this.
I would just buy all new Roland PSB-120 adapters, but at ~$40 a pop that feels like a pretty large investment, since that's about what I paid for each of these modules.
My questions for VOGONS:
1. Have you ever had a power brick clearly damage a piece of equipment like a sound module? If so, was it an old brick or a modern cheap one?
2. Are the old, original Roland bricks that are reading higher voltage when disconnected safe to use? Is this normal? And explain please...
3. What do you personally use to power your modules?
Now for some blitting from the back buffer.