Author |
Message |
mopie992
Joined: Dec 17, 2016 Posts: 6 Location: Ohio
|
Posted: Mon Jan 07, 2019 12:03 pm Post subject:
AC-AC power for modular question |
|
|
Hi hi hi
Making the jump to modular and I am starting simple... I think.
I have purchased a couple Frequency Central's DIY power PCB, bought the components for +/- 15v and got the recommended wallwart... -- AC-AC Wall Adapter 12 V@1A 2.1mm (https://www./webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=10081)
So
question is... I've only ever made desktop noise makers with 9v battery (dc) and since this power unit is AC... do I need to do anything different with my modules? or is 15v 15v no matter if its AC or DC ?
I believe FrequencyCentral is on here. but not sure how to @ them in this system.
Thanks in advance. |
|
Back to top
|
|
|
JovianPyx
Joined: Nov 20, 2007 Posts: 1988 Location: West Red Spot, Jupiter
Audio files: 224
|
Posted: Mon Jan 07, 2019 1:10 pm Post subject:
Re: AC-AC power for modular question |
|
|
mopie992 wrote: | Hi hi hi
Making the jump to modular and I am starting simple... I think.
I have purchased a couple Frequency Central's DIY power PCB, bought the components for +/- 15v and got the recommended wallwart... -- AC-AC Wall Adapter 12 V@1A 2.1mm (https://www./webapp/wcs/stores/servlet/ProductDisplay?langId=-1&storeId=10001&catalogId=10001&productId=10081)
So
question is... I've only ever made desktop noise makers with 9v battery (dc) and since this power unit is AC... do I need to do anything different with my modules? or is 15v 15v no matter if its AC or DC ?
I believe FrequencyCentral is on here. but not sure how to @ them in this system.
Thanks in advance. |
AC and DC are radically different things.
DC (direct current) is a steady, same voltage all the time power source. DC has no wave form.
AC (alternating current) is constantly changing. AC from the mains has a sine wave shape, so it is going up and down and also from positive to negative to positive etc.
Trying to power something needing DC with an AC source is asking to smoke it.
As long as you use DC at the correct voltage with a module, you'll be OK.
Another issue that you didn't mention is current. Current is measured in amperes (sometimes in milliamperes) and is important as well. If a module is said to need 15 volts at 150 mA (milli-amperes) that means that the supply needs to be DC, 15 volts (unless otherwise specified positive is assumed) and must supply at least 150 mA. This means it's OK for it to supply more current than 150 mA. It is good practice to use a supply that can push more current than needed. _________________ FPGA, dsPIC and Fatman Synth Stuff
Time flies like a banana. Fruit flies when you're having fun. BTW, Do these genes make my ass look fat? corruptio optimi pessima
|
|
Back to top
|
|
|
wackelpeter
Joined: May 05, 2013 Posts: 461 Location: germany
Audio files: 10
|
Posted: Tue Jan 08, 2019 10:44 am Post subject:
|
|
|
Do you have a link for those Frequency Central PSU PCB's?
As it seems, while you said you have the components for 15V +/-, These boards are 15V +/- and you have a 12VAC wallwart, which wouldn't be enough to get 15VDC out of it... You would Need at least a 15VAC wallwart or better and more common a 18VAC wallwart.
First of all it's good that you took the path using a wallwart PSU when you have no practice with mains current circuits etc.. That's what i would advice anyone who isn't well versed in that field.
I don't know exactly what voltages you would Need from your PSU, if you actually would want a 12V DC +/- PSU then this could work and you just had to Exchange the Regulators if These are 7815 and 7915 types for the 7812 and 7912 respectively. But if you want 15V DC +/- then you would Need another wallwart with more than 12VAC Output.
1A sounds okay if you didn't want to power a great rack. but i wouldn't take much more load as 600mA out of it, because then they loose stability quiet often and you have ripple on your power rails, which you could improve a bit with some bigger electrolytes but also there is a limit when this wouldn't help anymore. And well with 600mA you would also have to consider to put the Right size of heat sinks into your PSU... I Always build them myself leaving enough space to get in at least an additional pair of electrolytes and a bigger sized heatsink… and if you use just one big heatsink, you have to electrically Isolate the 79xx Regulator, because there it's not the Ground that is connected to the metal housing or Strip of the TO220 case it's either the in- or Output (i Always Forget which one) and this would create a short.
At least one advice, you might Keep in mind, i would suggest you to Keep logic modules like sequencers, Clocks and dividers, etc. at a separate PSU because they tend to affect the power rails more and you will recognize this on your Audio paths (VCO and VCF,etc.) _________________ https://soundcloud.com/bastian-j |
|
Back to top
|
|
|
|