could you guys take a look at this circuit and tell me if the five volt part will work. its a 24 volt center tap so i should get 12 volts from the center. and with only one diode i should only get helf of the wave which would be six volts or a little over 8 to the peak once the cap is charged.i hope to have enough to overcome the dropout of the regulator. could i get by with any lower valued capacitors on either side of the regulator? i just put 4700 because thats what i have. the five volts is for a isd1110p chip and thats all. does it look ok?
i just noticed the diode is in backwards. my main concern is if the cap before the 7805 is going to smooth out the choppy wave enough for the regulator to do its job.
There's nothing wrong with that but why not use one 24V-0-24V transfromer rather than two smaller transformers?
i just noticed the diode is in backwards. my main concern is if the cap before the 7805 is going to smooth out the choppy wave enough for the regulator to do its job.
the smaller transformers were cheaper because i did a lot of searching for a bargain and they were pretty cheap...but no 48volt ct. if i were to order out of a cataloge im sure it would be cheaper than two though.
There's a much better way to hook up the transformers and rectifiers. Hook the two transformers as a 48VCT arrangement. Use the CT of 48VAC as COMMON. Use ONE bridge rectifier. Connect the AC input of the bridge to the two outside AC lines from the transformer. The DC outputs of this bridge are approximately +/- 32VDC.
Connect a second bridge to the two CT windings. The DC outputs of this bridge are +/- 16VDC. Use the +16VDC as the input to your 7805.
the smaller transformers were cheaper because i did a lot of searching for a bargain and they were pretty cheap...but no 48volt ct. if i were to order out of a cataloge im sure it would be cheaper than two though.
I haven't seen a 48V centre tapped transformer before but I've seen plenty of transformers with twin 24V secondaries that could be connected in series for form a 48V CT transformer.
It is coming 32.5VDC isn’t it if he takes the two CT loops?
For Gaston
But your two transformers is not a good solution. If I want to power your project I will simply buy a 28V-0-28V – 12V transformer without thinking money because need to do a proper design. But the voltage will be little high to the amp! No problem – More sound
Oh, I just thought that since most transformer primaries and outer secondary wires are not colour coded for proper phasing, that Gaston should measure the total secondary voltage once the circuit is built, and that it is ~48VAC. The circuit will work either way, it's just that wired the wrong way, the rectifiers will put out 60HZ DC instead of 120HZ. (or 50 instead of 100 in UK). Filtering is easier the higher the freq.