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Member postings for Geoff Theasby

Here is a list of all the postings Geoff Theasby has made in our forums. Click on a thread name to jump to the thread.

Thread: Mains power supply for 12v dc motor
31/08/2019 08:16:00

Brian, LED's draw miniscule currents, of the order of milliamps, individually, so a lighting controller would be far too weak. The idea of a 12 volt battery is a good one, as is a PWM controller. I have one costing about £10 which will handle 60 amps. **LINK**

Hang this off a suitable power supply, say 12 or 24 volts DC , like this: **LINK** and Robert's your aged relative.

Thread: How can this work?
22/08/2019 17:41:36


dscf0808.jpgHow about an orange v-belt?

Thread: strange power socket
16/08/2019 10:33:32

S.O.D., I have one of those 'alternative' 13 amp plugs. I often wondered at its purpose, and only kept it as a curiosity.

Thread: Is there a type of Sellotape/"sticky-backed-plastic" that forms a PERMANENT bond
30/07/2019 20:25:52

I was going to suggest Kapton tape, too. What Andrew has is called self-amalgamating tape, much used for outdoor sealing purposes. Stretch it round the item to be sealed, and it bonds with itself, can only be removed by destructiion.

Thread: 3 phase - radio puzzle
30/07/2019 16:47:55

Look for IEC (International Electrotechnical Commission) EMI (Electro-Magnetic Interference) power line filters, about £10, they plug in, you don't need to open them up.

30/07/2019 11:14:49

Radio Devon is on six VHF channels in the area, two MW freq's, DAB Multiplex 10C (Between 174-240 MHz) Freeview Ch. 720, and iPlayer. Mix and match these for best reception on each radio.

30/07/2019 10:46:16

No one has mentioned or asked the frequencies or bands in use by these radios. Medium wave, VHF/FM, DAB? If they are set to different bands, it is quite likely that one will be interfered with but not the other, even if listening to the same station, Radio Devon in this case.

Thread: Acetone
28/07/2019 09:54:43

Acetone is readily available here in UK, in particular from the Ladysave chain, as nail varnish remover.

Thread: Guess the Chemical?
28/07/2019 09:50:58

Dave, small amounts of water added to red hot coke = Producer Gas? Some railway locos were designed to generate and use it.

Thread: water supply
16/06/2019 08:35:07

I recall that when Keilder Water was built there was much muttering about t being a white elephant. Now, water is being piped South as requested.

Thread: Basic questions about wax chucks
29/05/2019 09:53:20

My wife, Deborah, needed some wooden buttons for her knitting project, so I made some from a fir tree we had chopped down in the garden, and was seasoning in the garage. I made such a chuck from aluminium bar, about 50 mm across, and turning a recess of about 3mm in one face. Filling the recess with 'hot glue' I stuck on the button blank and let it cool. I found that I could carefully turn a presentable button in this way, which could be levered gently off, and reversed the process to face the other side, and several others followed.

Don't be afraid, experiment!

Thread: Blurred picture
23/05/2019 22:09:25


I took that picture with a Panasonic Lumix DMC FS-35 compact camera, which is capable of taking great shots. The one in question, Photo 2, is 5.9 Mb in size, well above the minimum required by M.E.'s editors. The fault is mine, in that there is a little camera shake, or loss of focus, I can't tell which. I used the picture as I thought the subject matter interesting, even if the technicalities did not quite meet your exacting standards. May I point out that the slick and glossy photos to which you allude are taken with equipment very much more sophisticated and costing tens of thousands of pounds, then 'photoshopped' endlessly to get the best possible results.

Thread: A visit to Manchester Sci and Eng Museum
02/05/2019 13:35:47

Regarding the Merlin, I have just skimmed Stanley Hooker's chapter on Merlins, and found the Ford/tolerances section, but not another item I remember from somewhere. Ford or Packard suggested using head gaskets, instead of the metal to metal joints originally used. This meant cutting several operations and speeded up production considerably.

Thread: A Unique Word?
27/04/2019 06:51:59

At least one club publishes a 'newssheet'.

Thread: Wentworth woodhouse
22/04/2019 21:39:42

There's a Myford and many tools at Sheffield Auction Galleries this week, Viewing Thursday, auction Friday or Saturday.

Thread: miniature 3 pin sockets
28/03/2019 06:58:29

Basically, you need Molex connectors. If a panel plug/socket, do not use stereo jacks, as has been said, because the wrong contacts 'make' as they are connected. Microphone connectors, available in many 'ways' can be used, but not if there is danger of harmful, inappropriate connectors being mated, causing hazards.

Thread: Wentworth woodhouse
22/03/2019 15:02:31

How wonderful, Mick. WW is only a few miles from here, and this year we are going on a tour, when it reopens. I've seen some photos, and we have walked through the estate, gardens and garden centre.

Thread: LED lighting
08/03/2019 18:22:36

AdrianR, on a point of information, yes, SCR dimmers did that, if suppression circuitry wasn't designed in. However, using a zero-crossing circuit, which switches the current on or off at the very point at which the mains sine wave (Ha!) goes from +ve to -ve, results in little interference, and it is easily suppressed.

08/03/2019 11:12:52

LED lights are great, and very versatile. For domestic situations straight replacement is good, but the dearer ones £3-ish are better than the 'bargain' types. Philips Hue are expensive but can change colour and intensity. For the workshop, I buy reels of LEDs at £8 for 500, on a self adhesive strip, with suitable resistors, often run on 12 volts from a 'wall wart'. These strips can be stuck up anywhere, or fed through clear plastic tubes to make a strip light.

Thread: Plastic Balls in Bearings?
26/02/2019 09:38:55

Re: Dyson, I originally got one because they are good at picking up dog hair. They filter the air, which helps asthmatics, they do not lose suction, you can see when they are full. I also have a newer VAX. It clogs up regularly, sometimes every time it is used. It is lighter, and it is cordless.

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