Help with Symetrix 544 power transformer

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#5
There are plenty of "pin through " PCB transformers online at say 24 volts ,if you cant find an exact mechanical match you can drill the PCB to suite and reroute the connections watching you don't interfere with the copper on the other side.


Do NOT !!! try to bend the pins to fit --you have been warned.
 
#7
After voltage: as a first crack, get one the same *size*.

I doubt this is 20-24V @2A, maybe nearer 0.5A, but it has been a while since I fondled transformers for pay.

EDIT: we can scale the size of the original against the DIP chips with 0.1" pin spacing. The original seems to be about 2/3rd of the linear dimensions. So it is probably 0.3X the weight and the VA. Which puts it near 12VA-15VA, or 48V 0.3A.

Working the other way: 2 dozen(?) chips at 5mA-10mA each is 150mA-200mA DCwhich suggests a 0.3A AC rating.
 

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#9
Today I mounted two toroidal transformers in series ( 12V 1A each one ), for checking voltages and power consumption.



The voltage regulators works are expected. And the power consumption, measured in AC on each secondary winding of transformers are 34mA more or less, so with two windings they are 170mA more or less. It's possible?


If I check the voltages and power conumptions rigght, a transformer with 12-0-12 and 0.5mA it's enough.



I'm thinking on put an external transformer like the ones on mixer consoles, only for avoid drilling pcb and other botched job.


Behringer PSU6-EU – Thomann Espana


Behringer PSU5-EU – Thomann Espana



And this is a photo of the multimeter:


https://i.ibb.co/rfCb0WZ/IMG-20200822-105618084.jpg
 
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#10
It obviously needs less current than I thought , personally I am not keen on using external power supplies for a PCB intended for a mains transformer due to pick up of external radiation due to the long leads used to feed the PCB but if you are happy with it its your choice .


A "botched job " is only that if it is not thought out and "rushed " I would still fit a soldered in mains transformer it just requires thought on the layout .
 
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