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Old 31st August 2012, 08:20 PM   #11
Marra is offline Marra  United Kingdom
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These are a nice switch for two inputs.

5646A9 - APEM - SWITCH, DPDT | Farnell United Kingdom
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Old 1st September 2012, 08:52 PM   #12
Einric is offline Einric  United States
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Digikey also carries DP3T switches if you want another input.
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Old 2nd September 2012, 04:30 PM   #13
tsiros is offline tsiros  Greece
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Quote:
Originally Posted by TP143 View Post
The stock supply caps are 2@10uf but the recommended mod is 4@6800uf, not 6.8uf. I wanted to make that correction for future scanners of this thread.

you sure they said 10uF and not 10mF?
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Old 2nd September 2012, 06:03 PM   #14
SoIL4x4 is offline SoIL4x4  United States
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The audiosector kit come with 10uf (microfarad) capacitors.
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Old 2nd September 2012, 08:10 PM   #15
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Quote:
Originally Posted by SoIL4x4 View Post
The audiosector kit come with 10uf (microfarad) capacitors.
yes! they come with 10uf for power supply (joke).
I am very happy with my TKD in my amp too. it is very smooth and it is a big step up from Alps for sure
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Old 2nd September 2012, 09:07 PM   #16
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If you are going to parallel the LM4780 it's a good idea to match each amplifier's Rf and Rg to 0.1%

Vee and Vcc should be bypassed with 10uF electrolytic AND 100nF ceramic.
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Old 3rd September 2012, 09:59 AM   #17
AndrewT is offline AndrewT  Scotland
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Cs in the datasheet are mandatory.
yes, once you have Cs fitted then you can experiment with values, but they must be fitted first.
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Old 3rd September 2012, 12:36 PM   #18
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And while you're at it -- if you're going to switch the mute, then a little electrolytic on the mute pin is helpful -- but make sure to note the polarity.
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Old 3rd September 2012, 07:04 PM   #19
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I actually just got some SMPS from connexelectronic for my LM4780's (for bass) and LM3875's (for alpair 12), sounds very nice, ended up being cheaper than the good'ol power transformers, but I have heaps of them anyways. Put them in a MDF box I glued together for the purpose, everything is connected to the heat sink. Planning on adding an active xo and use the aux power from the SMPS for it. Just have to use my minidsp to figure out what I need first. And build the boxes for the Alpairs...
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Old 11th September 2012, 08:27 AM   #20
sangram is offline sangram  India
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The PD kit comes with 1510uF total capacitance per rail per amplifier. 1500uF on the ap board and 10uf on the PSU board. PSU board takes 10,000uF snap-in capacitors pretty easily. I have 4700uF+1500uF+10uF fitted on 4 amplifier boards (2 PD kits) in bridge-paralleled configuration and there is enough bass to pull down a wall, even with the tiny little Zaph L18 speakers.

Note the earlier caution about running multiple PS units off the same transformer. In reality it does work, But you have to absolutely match diode polarities. It caused me a lot of confusion the first time around. Each pad on the PSU board must be routed to exactly the same winding output terminal else the back-to-back diodes effectively short-circuit the winding.

Last edited by sangram; 11th September 2012 at 08:29 AM.
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