Re: Voltage regulator ID

From: David M (news_NO_at_SPAM_moorhouse.net.nz)
Date: 08/28/04 

Date: Sat, 28 Aug 2004 14:28:31 +1200

On Fri, 27 Aug 2004 07:40:24 +1000, Franc Zabkar
<fzabkar@optussnet.com.au> wrote:

>On Thu, 26 Aug 2004 11:41:52 +1200, David M
><news_NO@SPAM_moorhouse.net.nz> put finger to keyboard and composed:
>
>>Hi,
>>
>>I need a bit of help with the identification of the following voltage
>>regulator.
>>
>>It's on the circuit board of a Rainmatic 3000 irrigation controller -
>>which I don't have schematic for.
>>
>>>From screen printing on the circuit board and checking with my DMM, I
>>have the following:
>>
>>Package type looks like a TO-252 or similar
>>(approx 6mm 0.25in square)
>>
>>(In fixed pitch font - top view)
>>
>> -------
>> | | ---- Gnd
>> | 0 | ---- In (also connected to die/heatsink)
>> | | ---- Out
>> -------
>>
>>Most of the markings on the front are illegible, can see 31 somewhere.
>>
>>I've tried looking at the LM117/317 but the pinouts are wrong.
>>
>>Voltage in is 6 volts - Vout is current 0v (hence why I need to fix
>>this !).
>
>Does it look like this?
>http://www.nteinc.com/graphics/diag59b.gif
>
No, this package is too big. The one I've got is only 6mm (0.25in)
square with a very small tab (heatsink) at the top which is soldered
to a copper pad on the board. The tab is connected to the centre
(input) pin.

>If so, then it could be one of Sanken's SIxxxx series of 3-terminal
>regulators, eg SI-3062V.
>
>See http://www.allegromicro.com/skncatlg/regulator/regulator.pdf
>
>If you can't find the SI-3062, then get an SI-3052, lift the ground
>pin, and boost it with resistors in the same way as for an adjustable
>regulator.
>
>
I might just try to replace it with a 7805, I've got the room on the
PCB to change the mounting.

Thanks for your suggestions.

David

Relevant Pages

  • Re: ? Fixing Burned Flatbed Scanner Power Resistor
    ... the + terminal to the input pin on the 7805, ... voltage between its tab and its left hand pin, to confirm that you have the ... then the problem is downstream of the regulator. ...
    (sci.electronics.repair)
  • nighthawk 550 electrical problem
    ... > Maybe you're not clear on the concept of the rectifier regulator unit. ... The rectifier and the *voltage* regulator. ... > on the voltage regulator to the DC positive output pin. ... check with the black lead from the AC input pin to the DC ...
    (rec.motorcycles.tech)
  • Re: nighthawk 550 electrical problem
    ... >> Maybe you're not clear on the concept of the rectifier regulator unit. ... >> You test the voltage regulator operation by doing the "charging ... >> on the voltage regulator to the DC positive output pin. ... >> check the first three diodes, touch the black lead's probe to the AC ...
    (rec.motorcycles.tech)
  • Re: Weak TZ Flippers.
    ... There are also jumpers from pin 6 to pin 5, ... sufficient flipper power. ... J907 pins 1 and 2 are jumpered by a Blue with Yellow stripe wire, ... other voltage sources. ...
    (rec.games.pinball)
  • Re: $29.99 amp revisited...
    ... >>I'll replace it with an accurate resistor. ... >>Pins 1 and 6 are signal to my driver tubes, typical voltage divider I ... >>directly to Pin 2, then a resitor back to ground. ... I was looking at several other amps (Moonlight ...
    (alt.guitar.amps)