***Official Electronics Thread of Officialness (it starts off with lots of Nixie Tube Clock goodness

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Burnsy2023 said:
I would like a pair of bluetooth speaker, what's wrong with that?
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Well apart from destroying some genuinely useful lab equipment and an relevant educational tool, there is the practical aspect.

How many speakers have you seen in a plastic box? A few?
How many speakers have you seen in a tin can? None?

Yep, they all come in wooden boxes because that's the stiffest material that's easily crafted and it doesn't resonate. (and doesn't look like poo)

Are you missing the point here about faraday cages? :confused: You are hoping to put a wireless receiver into a metal box... There is a cunning flaw in this plan ;)


I hate scrolling past that gutted AVR, it looked mint and now it makes me wince. I'm pretty sure I'm going to feel the same way about this proposed Bluetooth thing.
However a nice hardwood wooden speaker box with brass edgings, that's more the look I think.

I hate making a fuss because I think you are a great guy, but some people used this stuff the first time around and like to think it has some use still.
If I was building a rate meter from scratch, having a dial meter that was labeled "Counts per Second" would be perfect.
Less use for the scope, but you could get a slow scan TV picture on that, and it would make a great steampunk object coupled with a fresnel lens like the one out of the film "Brazil"
 
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bitslice said:
Well apart from destroying some genuinely useful lab equipment and an relevant educational tool, there is the practical aspect.

How many speakers have you seen in a plastic box? A few?
How many speakers have you seen in a tin can? None?

Yep, they all come in wooden boxes because that's the stiffest material that's easily crafted and it doesn't resonate. (and doesn't look like poo)
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A valid point but something that's not insurmountable.

bitslice said:
Are you missing the point here about faraday cages? :confused: You are hoping to put a wireless receiver into a metal box... There is a cunning flaw in this plan ;)
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I'm looking at running a small external ant around the handle or out of the back.

bitslice said:
I hate scrolling past that gutted AVR, it looked mint and now it makes me wince. I'm pretty sure I'm going to feel the same way about this proposed Bluetooth thing.
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Well perhaps I should have thought twice about doing it to a model 7, but I'm still enjoying the results.


bitslice said:
However a nice hardwood wooden speaker box with brass edgings, that's more the look I think.
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I like the idea of using equipment that is EOL into something useful today.

bitslice said:
I hate making a fuss because I think you are a great guy, but some people used this stuff the first time around and like to think it has some use still.
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I will post pics on Friday of everything. If there is something specific that you could use and don't want to see modified, email me and I'll see what I can do.
 
ezmpnn.jpg

swpdlh.jpg


More to follow.
 
yeah i imagine it's much better for logging and running recorded signals alongside currently measured ones (plus i don't think there are many crts that have more than dual beam.)

but they look sooooo cool :D
 
Tefal said:
yeah i know there's a lot of reasonably accurate bodge jobs using a pc etc.

but the cool CRT ones are :p
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I got a CRT analogue scope from the bay for <£30 delivered. From 1984, 1MHz, dual channel. Still working! It's Farnell own brand so it wouldn't have been terribly expensive even at the time, but as I say, still working. 1MHz is still infinitely better than nothing, particularly when you're mostly dealing with audio.
 
Borden said:
Asking this here as I'm guessing you guys will likely know more about the subject. I have a PicoPSU and external FSP adapter (FSP150-AHBN1) for my pc. The FSP adapter makes a constant high pitched squeal which is very irritating. It changes pitch depending on the load on the computer, simply launching a program will change its pitch which makes it even more annoying.

I'm guessing that it has something to do with the capacitors inside making noise? Anyone know if it can be fixed or is it something I have to accept happens on these kinds of adapters?
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Borden said:
Ah I see. Well I decided that I didn't want to take it apart as it's still under warranty. I've managed to sort out an RMA so hopefully the new one should be better. I didn't know that was what caused it but it seems like a simple fix. I shall bear it in mind for the future if I ever come across this problem again.
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Just to update on this. I did try using hot glue to dampen the coils, however the offending component was out reach from the glue so it didn't work.

I resorted to another solution, making a silencing enclosure for the PSU from a foam padded box my hard drive was delivered in. It works surprisingly well :p

Anyway, a couple of weeks ago I decided to fix another coil whine problem, with the culprit this time being the ac adapter for my sony alarm clock, plugged in across the room. I hacked off the cable and soldered it to a usb cable, now it's powered from an old phone's USB wall adapter. No noises at all.

Now the interesting part is that since doing this the coil whine for my PC's power supply has completely stopped! In addition to that, I had been experiencing noise through my speakers any time I decided to use the tone controls on the amp. This has completely vanished as well!

So upon fixing one pesky clock adapter, I have managed to inadvertently solve two other problems. I didn't realise that a single adapter could have such a negative effect on the mains supply for the house!
 
Here's my latest little project.

I wanted it to look totally awesome and I think I have achieved it :)

The arrow was for something else.

P1040353.jpg


It's an IR remote extender circuit. It allows me to send a 38kHz IR signal down to an IR LED some distance away so I can control my Sky HD box which resides 3 rooms away. I couldn't really use a magic eye as one is already in use as the Sky box sits in a cupboard.

The circuit is not my own design.

I had previously mounted it on veroboard but I just couldn't get it working with a long LED lead attached. Not sure if it was stray capacitance of the board or just some dry joints.
 
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