Do you need heatsink on the 3 watt luxton LED? I notice it's got a aluminium case. Would a Diacast box be enough? Also how big a heatsink is required for the...
Hi Murry, I used the diecast box as the heatsink. It works well and only gets hot after about 3 hours of continuos operation , so far so good. regards Ralph...
G'day Murray, According to the datasheet: http://www.lumileds.com/pdfs/DS46.PDF The Luxeon III is more like 4.5 watts. It shouldn't be run for more than a...
John, Here's the reply from the Mike Groth regarding your problem. Regards, David Smith. ... Dear David, Thanks for the email. I checked up on the question...
I built mine in a diecast box. The lumiled is on the diecast box with white heat compound. The MJ15003 is on a heat sink. The resistors one 10w 3.3 ohm and 3.9...
... Today I mounted a small computer fan to keep the resistors cool. Now the whole thing including the MJ15003 is quite cool. I will run it for a while to see...
Yep the rx is now going. We are on the edge of the city. There are no street lights visible from our place except one light up the hill. The street light hum...
Hi Murray, Good to hear you got the receiver going and being able to receive the hum reflected off the clouds! Did you build the receiver as shown on the web...
... Hi John, I used K3PGP, MPF-102 AND 2N5088 circuit I got the 2N5088 from South Island componate center in Christchurch. I built it on a home made PC Board ...
To ALL Now that I have built a receiver does anybody have a power hum filter say with a 741 or double 741 equilvant say to put between the K3PGP, MPF-102 AND...
http://www.dse.co.nz/cgi- bin/dse.storefront/43c0b6d005ba1e9a273fc0a87f990752/Export/catalogs/SUP 1000101 Have a look at the Dick smith equivlant charts 73...
http://www.sicom.co.nz/xurl/PageID/2214/function/viewprd/prd_id/68315/c ontent.html Also Altronics 2001 catalogue list them as Z1246 but on web nothing. 73...
BC179 TO-18 PS 20 25 100 0.3 10 125-500 2 150 10 300 G.P. S.S. Amp. BC159, BC309, BC214 The site did not work straight from the url The equivlants are...
Hi Murray, I built a bandpass filter that cuts off at 300Hz and 5kHz - the upper one to cut out the PWM carrier frequency. It consists of cascaded 4-pole...
As anyone who has tried one of the red Luxeon III's will know, they are incredibly bright and should not be viewed directly for any length of time. My Tx...
... I built a bandpass filter that cuts off at 300Hz and 5kHz - the upper one to cut out the PWM carrier frequency. It consists of cascaded 4-pole active...
Hi Murray, The circuits for the low-pass and high-pass filters were attached to the previous email. As for the layout, that was done ugly-style on Veroboard...
Chris Long has asked me to pass on to the group that he will be giving an updated version of his Optical Communications presentation to the Eastern and...
Hi David, Any chance of video recording the up-coming optical group meeting? I'm sure the group members who cannot attend would learn a lot from the video. I...
Hi John, Chris has created a DVD of his presentation and that's probably what he'll play to the meeting. Either that or a Powerpoint show (if there's a laptop...
Hum filters I have been working for at least two weeks to somehow reduce the hum from street lights from my light receiver. I am using the BPW34 light diode to...
Hi Murray, The lights will flicker at 100Hz, given that the light output is proportional to the magnitude of the voltage (picture the (unfiltered) waveform out...
Hi all, I built a couple of 350Hz high pass filters and found it all a waste of time. in the field we have found that the beam width in so narrow that over a...
I have just posted a pic of my Optical reeiver in the photo section . It can be viewed up to 800 by 600. It is on 3 PC Boards left the K3PGP reciever, Middle ...
Hi Murray, Looks good. Do you think you could hand draw a cct diagram of your filter, scan it and post it too. Unless you've got a drawing package, that is. ...
I enclose 4 pic's of my rx using the K3PGP RX and the now switchable 100hz filter and the Jaycar LM386n amp. The CCT of the 100 Hz notch filter and shaper to...
PCBs the third way The normal way now is photo sensitive PC Board and make the tracks through the many programs available on the PC and use a light to photo...
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