Hey there guys!
Okay so I am currently working on a homemade balancer. (circuit found on web requires a +8V -8V GND) now so far i can power this with an old bench top power supply i have(1A 20VDC Variable). My problem is in this circuit has half as a amp/comparator to led trigger and the other a PWM Motor controller. Now I cant get enough juice out of my 1A power supply to power my motor loaded. So i would like to make my own power supply but i cant figure out how to make what i need maybe you guys can help.
The issue is i need a power supply that can produce about 3-6 amps at 12VDC PWM and as well make a 8-10V +/-/GND now every time i try this (over 20 ways) with a non CT 12.6V transformer I get 16.4VAC out then after dual full wave rectification i get 23.1V+ to ground 23.1V- to ground and 46.2Vpos to neg. Ive tried one rectifier/ two of the same transformers/one transformer/ dual rectifiers.... and so forth. Now how do I do this and get the same all three ways and not have it doubled from Pos to Neg? My 1A bench power supply does this no matter what i set it too, Neg or Pos to GND is the same as Pos to neg.
Now my thoughts where maybe i need a CT transformer? im lost but Im also way lost on how I get 16.4VAC and rectify it to a higher vdc value... isnt that suppose to be lower that 16.4? and it says is a 12.6v 300ma (radio shack)
Well this is what i am thinking of getting as my transformer http://www.signaltransformer.com/sites/all/pdf/241.pdf 241-8-12....... Now im not sure how to calculate what my rectified DC out will be I cant find the equation anywhere but will this supply around 12 DC at 3-6A? as well would this make my symmetrical part easier as well?
http://www.technologie-entwicklung.de/Trigger-schematic.jpg
As you can see here this is part of the main board i made. now im trying to supply me IC and damn near everything else with this 8V system and with the 12V portion run that through my buz 10. but i figured thats a pain in the butt to have to break this up so the lmc662 can hold 12V so if I just up my Cap Voltage values to 16 or 25V i wouldnt have to split anything. So yes scratch the 8V portion Ill just run all 12V in this so a 7812 and 7912. if i do that will my Pos Neg still double? So how can I get my +\-\gnd the same? with a CT transformer?
Oh and im not sure if those 7812 and 7912 can output 5 amps but i doubt it... so honestly if i can get anything between 10-14Volts +\- and GND after rectification i will be a very happy camper to not have to also step my dc down again. so should i get a different VAC transformer or is that 12 volt one okay? cuz from screwing around with that radio shack one 16.4VAC rectified to 22Vdc is to high and pos to neg cant be doubled ... and much higher than the said 12.6. So are these two radio shack ones i have just whack or do you always get higher VDC after rectifying?
Thanks for any help guys sorry i kinda stated to talk to my self on this post lol..
Okay so I am currently working on a homemade balancer. (circuit found on web requires a +8V -8V GND) now so far i can power this with an old bench top power supply i have(1A 20VDC Variable). My problem is in this circuit has half as a amp/comparator to led trigger and the other a PWM Motor controller. Now I cant get enough juice out of my 1A power supply to power my motor loaded. So i would like to make my own power supply but i cant figure out how to make what i need maybe you guys can help.
The issue is i need a power supply that can produce about 3-6 amps at 12VDC PWM and as well make a 8-10V +/-/GND now every time i try this (over 20 ways) with a non CT 12.6V transformer I get 16.4VAC out then after dual full wave rectification i get 23.1V+ to ground 23.1V- to ground and 46.2Vpos to neg. Ive tried one rectifier/ two of the same transformers/one transformer/ dual rectifiers.... and so forth. Now how do I do this and get the same all three ways and not have it doubled from Pos to Neg? My 1A bench power supply does this no matter what i set it too, Neg or Pos to GND is the same as Pos to neg.
Now my thoughts where maybe i need a CT transformer? im lost but Im also way lost on how I get 16.4VAC and rectify it to a higher vdc value... isnt that suppose to be lower that 16.4? and it says is a 12.6v 300ma (radio shack)
Well this is what i am thinking of getting as my transformer http://www.signaltransformer.com/sites/all/pdf/241.pdf 241-8-12....... Now im not sure how to calculate what my rectified DC out will be I cant find the equation anywhere but will this supply around 12 DC at 3-6A? as well would this make my symmetrical part easier as well?
http://www.technologie-entwicklung.de/Trigger-schematic.jpg
As you can see here this is part of the main board i made. now im trying to supply me IC and damn near everything else with this 8V system and with the 12V portion run that through my buz 10. but i figured thats a pain in the butt to have to break this up so the lmc662 can hold 12V so if I just up my Cap Voltage values to 16 or 25V i wouldnt have to split anything. So yes scratch the 8V portion Ill just run all 12V in this so a 7812 and 7912. if i do that will my Pos Neg still double? So how can I get my +\-\gnd the same? with a CT transformer?
Oh and im not sure if those 7812 and 7912 can output 5 amps but i doubt it... so honestly if i can get anything between 10-14Volts +\- and GND after rectification i will be a very happy camper to not have to also step my dc down again. so should i get a different VAC transformer or is that 12 volt one okay? cuz from screwing around with that radio shack one 16.4VAC rectified to 22Vdc is to high and pos to neg cant be doubled ... and much higher than the said 12.6. So are these two radio shack ones i have just whack or do you always get higher VDC after rectifying?
Thanks for any help guys sorry i kinda stated to talk to my self on this post lol..