I am trying to repair an old Kenwood stereo control amplifier and need help in identifying the specs of these parts.

Capacitor:

I have found some 2200uF 35V 85° caps searching google and ebay but wasn't sure what the remaining markings stand for.

IC:

From what I can gather from google... its a Toshiba IC.

I can only assume that sourcing original parts will be near impossible so I will also need to find a place to purchase something equivalent.

Any help you guys could give is greatly appreciated.

-Dom

 

In regards to your capacitor, the voltage and capacitance ratings are the most important things to consider - which you noted. The capacitors you found online would work.

As for your linear regulator, here is the datasheet:

http://www.toshiba.com/taec/components2/Datasheet_Sync//265/5671.pdf

You can find the part at the distributor Mouser Electronics and I'm sure you'd find it at Digi-Key as well.

Austin

 

The other labels on the capacitor are date code and probably package-type info.

The three terminal device is a fixed 15 volt linear voltage regulator.

hgmjr

 

You guys are awesome!

In regards to the linear regulator... I just noticed that the second one I need to replace has a slightly different marking

Instead of TA7815S, the second one reads TA7915S

Is there a difference?

 

You guys are awesome!

In regards to the linear regulator... I just noticed that the second one I need to replace has a slightly different marking

Instead of TA7815S, the second one reads TA7915S

Is there a difference?

It isn't very difficult to look up datasheets for those parts, or virtually any part for that matter. Just remember; google is your friend! Another great resource is http://www.alldatasheet.com/

For this regulator, the datasheet is: http://pdf1.alldatasheet.com/datasheet-pdf/view/31360/TOSHIBA/TA79005S.html

Austin

 

Thank you for the resource Austin! that will definitely come in handy. I apologize for my lack of knowledge as I am no expert. I tried searching but all the different part numbers had my head spinning.

 

Thank you for the resource Austin! that will definitely come in handy. I apologize for my lack of knowledge as I am no expert. I tried searching but all the different part numbers had my head spinning.

No problem whatsoever! They also have some other good datasheet searching links posted in a sticky on this forum. Here you go:

http://forum.allaboutcircuits.com/showthread.php?t=3246

Austin

 

The 7815 is a fixed positive 15v 1A regulator.
The 7915 is a fixed negative 15v 1A regulator.
You must not get them mixed up!

I strongly suggest that you not buy replacement aluminum electrolytic capacitors via E-bay. You won't know how long they have been sitting on a shelf; and they do have a shelf life.

Buy from an authorized high-volume distributor, like Digikey, Mouser, Newark, Allied, etc. You will be getting fresh stock from a reputable company. If they've been sitting in a warehouse for 10 years, they won't do you much good.

 

Still trying to get my head wrapped around all the different characteristics....

After searching, I can only find 2 replacements (or so I think)

Can you guys please take a look and tell me if these will work?

For the TA7815S, I found this:

http://www.mouser.com/ProductDetail/Fairchild-Semiconductor/KA7815ETU/?qs=4UZqDwmZbi8adq412dRTEA==

However... there are some differences and I am not sure if they are significant. All other characteristics not listed are exactly the same for both.

Operating Temp:
TA7815S: -30 ~ 75°C
KA7815ETU: 0 ~ +125°C

Storage Temp:
TA7815S: -55 ~ 150°C
KA7815ETU: -65 ~ 150°C

Thermal Resistance:
TA7815S: Rth(j-c) 6.25 °C/W, Rth(j-a) 62.5 °C/W
KA7815ETU: Rth(j-c) 5 °C/W, Rth(j-a) 65 °C/W

Quiescent Current:
TA7815S: Typ. 4.4, Max. 8.0 mA
KA7815ETU: Typ. 5.2, Max. 8.0 mA

Output Voltage Noise:
TA7815S: Typ. 110 uVrms
KA7815ETU: Typ. 90 uV/Vo

Short Circuit Current Limit:
TA7815S: Typ. 0.5 A
KA7815ETU: Typ. 250 mA


For the TA79015S, I found this:

http://www.newark.com/nte-electronics/nte1973/voltage-regulator-ic/dp/31C3442

Here are the differences in question:

Power Dissipation:
TA79015S: (Tc = 25°C) 20W
NTE1973: (TC ≤ +70°C) 16W

Storage Temp:
TA79015S: -55 ~ 150°C
NTE1973: -40 ~ 125°C

Thermal Resistance:
TA79015S: Rth(j-c) 6.25 °C/W, Rth(j-a) 62.5 °C/W
NTE1973: Rth(j-c) 5 °C/W, Rth(j-a) 60 °C/W

Output Voltage (really foggy as to why they're reversed)
TA79015S: Min. -15.6, Typ. -15, Max. -14.4 V
NTE1973: Min. -14.4, Typ. -15, Max. -15.6 V

Quiescent Current:
TA79015S: Typ. 4.4, Max. 8.0 mA
NTE1973: Typ. 4.4, Max. 6.0 mA

Load Regulation:
TA79015S: (250mA ≤ IOUT ≤ 750mA) Typ. 25, Max. 150 mV
NTE1973: (VIN = –23V, IO = 0.005 to 1.5A) Typ. 35, Max. 150 mV

Line Regulation:
TA79015S: (-26V ≤ VIN ≤ -20V) Typ. 14, Max. 150 mV
NTE1973: (VIN = –17.5V to –30V, IO = 0.5A) Typ. 11, Max. 150 mV

Ripple Rejection:
TA79015S: Min. 53, Typ. 60 dB
NTE1973: Min. 60, Typ. 70 dB

Average Temp. Coefficient of Output Voltage:
TA79015S: (IOUT = 5.0mA) Typ. 2.0 mV/°C
NTE1973: (VIN = –23V, IO = 0.5A) Typ. -1.5 mV/°C

To me these differences seem major... but again, I am new to this so please try not to rip me apart too much

-DM

 

Am I over complicating things?

 

I would agree. In general NTE parts are more costly than from other manufacturers.

The choices in fixed regulators are endless. Back in the time when the original regulators were spec'ed, those 7815's and 7915's were good for about a one amp output. That is about all you need to be concerned about - plus perhaps using an isolation pad under the 7915, as the tab is connected to the input voltage, and needs to be isolated from the heat sink in most cases.

In Mouser, ON semi part#MC7915CTG @ $.49 and the MC7815CTG @ $.49 would seem to be satisfactory replacements. Just add "863-" to the ON part number for the Mouser part number. They are both good for a one amp output with heat sinking.

 

Thank you!