Question about Audio Players & Recorders
I HAVE A PHONIC POWERPOD 740 PLUS FROM THE INPUT VOLTAGE SWITCH 120/240 SELECTOR THERE IS A SMALL 35X30X30MM TRANSFORMER LOOKING AT THE SCHEMATIC DIAGRAME IT SAYS T940 120/24V BUT THERE ARE 3 PINS ON PRIMARY 240/120V I PRESUME ITS 24 VOLTS OUT IF USEING 240 OR 120...BUT THE RATING I'M NOT SURE. IT FEEDS 2 X DIODES 1N004 FROM EACH PIN THEN FROM THE ONE DIODE IT GO'S TO A 7815 REG 15V INPUT. CANT WORK OUT HOW MUCH CURRANT THIS WOULD DRAW? THINK BECAUSE OF ITS SIZE IT MAYBE 6VA BUT I DONT WANT TO PUT A LOWER RATED TRANNY THAN IT NEEDS OR WILL HAVE A OVERHEATING PROBLEM. I DO HAVE THE SCHEMATICS FOR THIS MODEL BUT NOT SURE HOW TO UPLOAD THEM ANY HELP WOULD BE GREAT
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Posted on Jan 02, 2017
That part can be purcahsed from tritronincsinc.com for $1.07 using part number 8-719-934-21.
Or the substitute can be ordered from BDENT.COM using part number HZS30L for .33 each.
Posted on Mar 27, 2009
On the cathode of the zener diode look for a filter cap and check its value the voltage of the zener should be less than the working voltage of the zener. Basicly its likely being used as a shunt regulator as protection and regulation of the voltage. When the zener hits a certain threshold it will breakdown and start conducting to ground until the supply regulates and then it will recover. If the filter cap for that voltage rail was 25V I would guess that the zener would probably be regulating between 12 and 20 volts. I'd pick a 15V Zener its probably +- %10 on the original and any system should be able to take a %10 tolerance as a general design rule.
Posted on May 07, 2009
SOURCE: Car Battery Charger - Repair
thats what i did on mine they blew when i hooked the cables up backwards (gotta watch that)
but i used 130 amp alt diodes from an old tractor alt i had
Posted on Jul 03, 2009
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