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Old 3rd March 2006, 10:10 PM   #1
glen65 is offline glen65  United States
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Iíve been trying to find the info on this transistor but havenít successful. It says C107 so I figured it might be a 2sc107 but no dice. It does have some odd readings when testing it. It may have built in resistors. Itís being used in a RCA 50 watt receiver made for Radio Shack. The model is STA3850. Itís being used on a small power supply board. I will post a couple of pics.

Any info appreciated.
thanks
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Old 3rd March 2006, 10:12 PM   #2
glen65 is offline glen65  United States
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Here is another view
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Old 3rd March 2006, 10:18 PM   #3
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I looks like a logic level switch ( a transistor with a base resistor )for to be driven by a logic signal...
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Old 3rd March 2006, 10:51 PM   #4
glen65 is offline glen65  United States
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Yes it does appear to be something along those lines.
I just havent been able to find any data on it so I can come up
with a replacement for it.
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Old 4th March 2006, 12:44 AM   #5
clem_o is offline clem_o  Philippines
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If its used to logic-switch, it can't be too critical? Trace the circuit, figure its polarity and perhaps just replace with a generic transistor with a small resistor inserted in series with the base?

Cheers
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Old 4th March 2006, 01:09 AM   #6
anatech is offline anatech  Canada
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Hi glen65,
It looks to be a DTC107 logic transistor I'm guessing. NPN. They are sometimes called an inverter. Clem is right, they are just a transistor with a pair of built in resistors.

A search pointed to Sony, Rohm made those series of parts. Measure the drops between B and C, E.

Is that for AC detect? Measure the voltages when the unit is on.

-Chris
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Old 4th March 2006, 02:52 AM   #7
glen65 is offline glen65  United States
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Thanks for the response I was having trouble getting the receiver to power up. The standby light works ok. I pulled this transistor out to check it then put it back in and now the unit works. I suspect it could be an intermittent failure of the component.
Thatís why I want to replace it.

thanks
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Old 4th March 2006, 03:14 AM   #8
glen65 is offline glen65  United States
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Quote:
A search pointed to Sony, Rohm made those series of parts. Measure the drops between B and C, E.

Is that for AC detect? Measure the voltages when the unit is on.

-Chris
B to E is 5.1 VDC
B to C is 4.5 VDC

If I remove the transistor the unit wont start. Press the power button once the standby led goes out. Press it again and the standby comes back on.
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Old 4th March 2006, 03:31 AM   #9
diy guy is offline diy guy  Singapore
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Default Transistor

Can it be a 2sc107

try this link

http://www.datasheetarchive.com/sear...ExactDS=Starts
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Old 4th March 2006, 02:35 PM   #10
anatech is offline anatech  Canada
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Hi diy guy,
Wrong case for one, this one is much more modern for two.

The most important clue .... 5 VDC on the base indicates an internal resistor. This confirms it as a digital switch transistor. A funny Sony number no less. There are DTC transistors that will sub fine. It works on 5V, so look in the logic sections of older VCRs and cassette decks. You may find something suitable on a board. DTA is the other polarity.

Try this link for more information http://www.rohm.com/products/shortfo...tr_index8.html

-Chris
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