Re: LF: Low energy bulbs

[M0FMT <m0fmt@yahoo.co.uk>]

Hi LF

 

If you are a Amateur like me trying to find components the cheap way then this may be for you;-

 

9W Philips so called energy saving SFL
Item	Component type	Electrical value	Units	Spec
1	Resistor	5	Ohm	0.125W
2	Resistor	5	Ohm	0.125W
3	Resistor	1	Ohm	0.125W
4	Resistor	700000	Ohm	0.125W
5	Resistor	387000	Ohm	0.125W
6	Resistor	48	Ohm	0.25W
7	Capacitor	100	nF	Poly ?
8	Capacitor	23	nF	Poly ?
9	Capacitor	2.3	nF	Poly ?
10	Capacitor	1.6	nF	Poly ?
11	Capacitor	2.2 Elec	Micro F	350Vw
12	Inductor	2.795	mH	Laminate  Core
13	Inductor	2.28	mH	Ferite Cylinder
14	Inductor	131 (for 9T)	micro H	Toroid R10 N30
15	Transistor	DK51		Bipolar
16	Transistor	DK51		Bipolar
17	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
18	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
19	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
20	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
21	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
22	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
23	Diode	1N4007	1000V - 1A	Gen Purp Rectifier
24	Diode	!N4141	Fast switch	small signal det

 

From this I have made a low power xtal controled Tx for 80m. and the Flurescent tube which always seems to be OK in "Failed" SFLs serves as a fine and spectacular RF indicator when located next to your LF antenna up lead.

Failed SFL units are a useful source of parts to the real Amateur.

Pictures available on request.

 

73 es GL Pete M0FMT IO91UX

---

From: Stefan Schäfer <schaefer@iup.uni-heidelberg.de>
To: rsgb_lf_group@blacksheep.org
Sent: Tue, 1 March, 2011 20:17:59
Subject: Re: LF: Low energy bulbs

Regarding energy bulbs, maybe it is an idea to put a well designed EMI filter into the bulb cable, as close as possible?

73, Stefan/DK7FC

Am 01.03.2011 21:04, schrieb qrss@talktalk.net:

I have one CFL at the moment which gives the same pattern on 24kHz. Over the years I have had all makes play up, one decided to wipe out 10MHz, that was due to a dry joint on a suppression capacitor. Dry joints have also caused other interference and total failure. I  have dismantled several CFL's, poor soldered joints are rife in them, some components can often be pulled dry from the PCB.
 Some designs are a nice source of a VLF ring core, material / type unknown, I have used them for coupling on two 500kHz / 136kHz multi turn RX Loops.

As for filament lamps, there is always the classic 'candle bulb effect' which wipes out  analogue TV, I did have the pleasure of finding one of those in a customers house once.

Eddie G3ZJO

On 01/03/2011 19:13, Mike Dennison wrote:

Today I noticed QRM on 136kHz that started when my wife switched a 
light on in our spare room. It had a low energy bulb by Status, and 
was marked "11W, 220-240V, 50/60Hz, 100mA". It is described on their 
web site as "stick type" and is bayonet fitting. The QRM consisted of 
rapidly changing noise sweeping back and forth across the band (see 
attached pic).

I replaced it with a Philips Genie WW287 light which did not seem to 
generate any noise.

The other low energy lights in the house are General Electric E27-ES 
11W bulb types which are very slow to get to full brightness, but are 
low QRM at LF. The rest are ancient filament types which are 
completely QRM-free of course.

So if you have this noise, perhaps it's one of your light bulbs.

Mike, G3XDV
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