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I have just completed the electrical construction part of the Mini Brute. When I applied power to the Resonant Board the regulators got very HOT... I have no chips installed in the sockets, I am using the stated 18VAC transformer, I have inspected the board looking for shorts or soldier spots and found nothing. I have no other boards plugged in to the Resonant Board. However I did take some measurements. 1. On the +5 VDC regulator pin 3 to ground I see 2.5k ohms, and on the +15 VDC regulator pin 3 to ground I see 3.3k ohms. Since this is the frist time I am constructing one of these I have no Idea what the norm should be for this circuit. Has anyone else had a simular problem?
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Did you use alot of flux? Did the solder leave flux? This has shorted out boards i have made. I just took some carburetor cleaner as prescribed by people from 4HV, and cleaned it off. I also use a nylon brush on my dremel, after using the carb cleaner. If i hadn't have done that, there would be shorts everywhere.
Registered Member #1845
Joined: Fri Dec 05 2008, 05:38AM
Location: California
Posts: 211
Well, there has to be some kind of short between ground and the +5V and +15V leads. Did you orient the electrolytics correctly. If there is nothing connected into the resonant board and you have no IC's on it, then most likely one of the electrolytic caps are either installed incorrectly or blown, or a combo of the two, and this is shorting out your regulators. Did you blow the diodes that form the half wave rectifier for the transformer?
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
Firstly, did you measure input and output voltages of the regulators? You should be doing this FIRST and FOREMOST. You should be getting 5V output and 15V output and at least 17VDC at the input of both regulators.
Secondly, since both regulators seem to be affected, I'm guessing something is installed wrong or blown on the front (input) end of the regulator circuit. Electrolytics installed backwards, Tantalums installed backards, Diodes installed improperly????
Finally, check all parts with polarity on the board. Tantalums installed backwards will act as a short. Also, diodes installed backwards (especially those 1N5819 protection diodes, will act as a short.
1. Check your input and output voltages 2. Check your polarities of all components
Also, if you have a short on one regulator, it could be pulling down the other regulator due to the input voltage dropping below 17VDC.
If i had my bets, I say you have a tantalum in backwards somewhere.
I checked and all components are installed but, I found that that CR-63 was bad (shorted). The 5VDC is working perfect and cool. On the 15VDC I found the if I remove C4,5 & 68 the 15VDC works perfect. So I shall change these components.
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Mini Brute Voltage Regulators getting HOT!!!
