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WTB: Sanken SAP15N & SAP15P (or STD03N & STD03P if compatible)
WTB: Sanken SAP15N & SAP15P (or STD03N & STD03P if compatible)
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Old 29th January 2008, 04:28 AM   #11
Landoctor is offline Landoctor  United States
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You use the sensor leg and attach the emitter resistor to that. You end up not using the emitter leg.
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Old 29th January 2008, 07:26 AM   #12
jan.didden is offline jan.didden  Europe
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Quote:
Originally posted by dtm1962
To eliminate the emitter resistor : Do you cut the Sensor Leg or the Emitter Leg and terminate 0.22W Resistor in series with the Emitter? Sensor?

I have new SAP16's ready to put in so would it better to put say 3W units external and it would be more reliable?

What rating is the internal emitter resistor anyways?
Dan,

I'm waiting for your response to my email on the SAP16's. Do you still want them? Please let me know.

Jan Didden
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Old 29th January 2008, 03:37 PM   #13
dtm1962 is offline dtm1962  Canada
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Sorry Jan!

I did finally find a source of SAP16's in Canada and in the process of ordering some replacements. I have been away on vacation thru the weekend.

Sorry about not responding sooner as I forgot about your current offer.

Dan
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Old 29th January 2008, 04:11 PM   #14
thorin is offline thorin  United Kingdom
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Thanks for the tips.

I checked the emitter resistors and they read correctly at around 0.22R, with no darlington shortcircuits either. So luckily for me, I replaced the fuses with the correct type, and the amplifier operates perfectly.

I guess it suffered some sort of thermal runaway. After checking the datasheets for these SAP15 devices i notice the maximum power dissipation rating exceeds the power deliverable by the power supply with these fuse ratings, whence the reason the trannies survived maybe

btw, does anyone know what the LEDs in this CA amp are for? its an indicator? or just implemented as diodes with prefered characteristics?

Cheers
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Old 2nd April 2009, 03:54 PM   #15
jaycee is offline jaycee  United Kingdom
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Voltage references for current sources in the circuit.

The problem with the A5/A500 is poor heatsinking. The heatsink is just an L-angle with folded metal fins.

The Cambridge amps that use LM3886 use this particular IC's "SPIKe" protection, which is on die and therefore very responsive. The SAP based circuit Cambridge used just has regular VI limiting.
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Old 2nd May 2009, 11:20 AM   #16
jackinnj is offline jackinnj  United States
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WTB: Sanken SAP15N &amp; SAP15P (or STD03N &amp; STD03P if compatible)
I bought a tube of these from Profusion in the UK -- the US distributor (Arrow) would only do a minimum lot of 500 -- as I only needed to make a few amps, I will sell to anyone in the US for my cost -- $4.25/pr -- which is lower than the cost and carriage for small quantities from GB. They are on my webstore at: http://www.tech-diy.com/Store/Hexfets.htm
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