Started a spare parts list

[skippydiesel]

1 hour ago, danny_galaga said:

Nope..it's a different design. It doesn't need it.

I stand to be corrected -My knowledge of electronics is virtually zero but I seem to recall that this is how the Rotax  regulator started out only to retrospectively advise the installation of a capacitor after multiple failures?

[Blueadventures]

16 hours ago, Underwood said:

Hello Danny, I just bought a Carmo Reg/rec and notice the wiring diagram omits a capacitor, did you fit one anyway?

Which model number is the one you got and have any others been using them.  Even an image would be great.  Cheers.

[Underwood]

7 hours ago, Blueadventures said:

Which model number is the one you got and have any others been using them.  Even an image would be great.  Cheers.

Hello Blue, its this one... https://www.carmoelectronics.co.uk/index.php?main_page=product_info&products_id=2276

 

I fitted it yesterday and it is working fine providing a healthy 14.4v whereas the original Ducati Reg/Rec was not giving more than about 13.5v

I've not tried a flight yet (weather is awfull here) but if I encounter any interference then  installing a cap becomes a consideration, though Carmo indicates  its not needed.

 

10 hours ago, danny_galaga said:

Nope..it's a different design. It doesn't need it.

Thanks Danny, so no problems with interference with radio or instruments without one (I use an EFIS for engine monitoring)

Edited Saturday at 08:01 AM by Underwood

[danny_galaga]

No interference in taxiing at any rate. I haven't flown with it yet. I think if it needs suppression, it's all ready built in. Like most things automotive. 

 

The capacitor on the other regulator seems to me to be a kludge. I feel the Ducati reg/rec is just not very well designed, and of course it's designed for motorcycles, where radio suppression isn't as critical. It must need some you'd think because otherwise you are causing interference in people's cars and houses as you pass.

 

There are some avionics guys here who can elaborate on the more technical matters, but the upshot is the Dutch reg/reg was designed for aircraft and so doesn't need the external capacitor. PLUS as you noticed, needs less wires. AND can't drain your battery just sitting there 🙂

 

It's the only aftermarket parts I've bought so far that was probably MORE expensive than the original. But well worth it just for the simpler and more efficient operation 😊

 

 

 

[skippydiesel]

Hi Danny,

 

Would be great if one of the electronics guru's would participate because I am just winging it - the capacitor may have an electronic noise suppression function (I don't know) but its main job is to smooth/take any"spikes" out of the charging system. 

[3rd harmonic]

Most of these permanent magnet alternators which are found on motorcycles and aero engine are a shunt type regulator. Essentially the control element 'shunts' current to ground to hold the voltage down as the output increases with RPM. A capacitor is a good idea on the output as this will tend to bypass any switching noise or spikes to ground, rather than relying on the battery which may not be effective. However large electrolytic's offen have a fairly low self-resonant frequency that may be only a 400-500Hz, above which the capacitor is behaves like an inductor. To ensure the capacitor remains capacitive a 1uf polypropylene film cap can be used to bypass the electrolytics....

A large filter capacitor means the alternator can effectively run the electrical loads without a battery connected.

Edited Sunday at 02:27 AM by 3rd harmonic
Extra info