Yeah spending 50% of the cost of the unit on upgrading the psu doesnt make any sense
I still have a unpopulated spot on my EE jumper where the "Built my own PSU" badge goes. Building a linear mains +-12V +5V supply sounds like a nice project.
I still have a unpopulated spot on my EE jumper where the "Built my own PSU" badge goes. Building a linear mains +-12V +5V supply sounds like a nice project.
Will there you go! Finding transformers you like are usually the hardest part.
I still have a unpopulated spot on my EE jumper where the "Built my own PSU" badge goes. Building a linear mains +-12V +5V supply sounds like a nice project.
Will there you go! Finding transformers you like are usually the hardest part.
Yes. That and when you look up "How do I pick a transformer" I realise I also lack the "I understand calculus" badge. AC sucks.
The whole VA rating thing might as well be Voodoo to me. I'm left looking for transformers that have a "Maximum secondary current" spelled out in the datasheet.
Finding a multi-secondary to provide 2x12V + 1x5V seems a next to impossible to.
Probably need another thread in Beginners, but... can I not just drop the +12V side down to 5V with a reg? Can I just series the 2x12V from the transformer and take the centre point at common?
I still have a unpopulated spot on my EE jumper where the "Built my own PSU" badge goes. Building a linear mains +-12V +5V supply sounds like a nice project.
Will there you go! Finding transformers you like are usually the hardest part.
Yes. That and when you look up "How do I pick a transformer" I realise I also lack the "I understand calculus" badge. AC sucks.
The whole VA rating thing might as well be Voodoo to me. I'm left looking for transformers that have a "Maximum secondary current" spelled out in the datasheet.
Finding a multi-secondary to provide 2x12V + 1x5V seems a next to impossible to.
Probably need another thread in Beginners, but... can I not just drop the +12V side down to 5V with a reg? Can I just series the 2x12V from the transformer and take the centre point at common?
"Versand: Möglicherweise kein Versand nach Niederlande"
I am assuming the same for UK
@paulca
Does your local municipal recycle centre allow you to browse/takeback brown goods?
Mine does not anymore, so you have to be sneaky. (they claim they can be held responsible if they allow people to take back faulty stuff)
But if so, typical non-digital era audio amplifiers/preamps have transformers in them that have +/- 15 V for the amp stuff, as well as usually a 12V or 6V rail for auxiliary stuff.
Or you can spend money and get those new, but personally I always feel extra pride/smart/aware by repurposing old stuff.
Output frequency calibration.
...
Brilliant. Adjusting frequency sends new values to registers 0x25 to 0x2A which are used during start up
I don't know what is inside but we now have a way to find out.
That could mean a way with a lookup table minimize jitter perhaps?
I tried every search under the sun on ebay and it never shows me transformers I want. That r-core search showed loads. I conclude that ebay search is rubbish. How come "Transformer 2 x 13 VAC" doesn't find anything, but there are literallly hundreds of r-core transformers with 2 x 13 VAC in the title... and the related items show non r-core transformers with similar outputs. Grrr.
Well I bought the german ebay one, but I have to ask the seller if they will ship the UK.
I put the request in English and Googlese German:
Können Sie an eine britische Adresse versenden?
Not sure if it would break your "badge earning rules" but to complete it, have you seen these
I have a couple of those, cybermaus (15v and 12v), and the ouputs are not very well balanced (something like +12.0, -12.7 on the 12v model). When I made my linear I went for the variable voltage version so that I could ensure that the outputs were balanced, and also to give flexibility to increase the outputs up to +/-15v if a future mod should require it. The board is a lot bigger, but it still fits nicely in the case with a 15v/9v r-core transformer (as you can see from the photo I posted a couple of pages back).
If you want to build your own, it's still cheaper to buy the kits from China to get the parts, then do your own layout on Veroboard.
The only reason I keep buying it (when not in a hurry) is that if I buy local, it is also junk from china, just someone else did the ordering for me.
Unless if Mouser of course. But you know, €20 handling fee, always.
I do sometimes order with them, but not the small stuff.
Is the CMOS not just simply a quick way to set a signal level square?
Possibly the only special thing is: If you increase Vpp, it does not dive negative.
Whereas if you make your own 3.3Vpp 1.65Voffset square, and increase to 5Vpp, it would accidentally go negative first, before you remembered to also change offset to 2.5V
(I have had that problem, luckily my DUT survived)
But to be honest: I feel all waveforms should consider that 0V case. If I have a Vpp and Offset such that Vbottom is 0V or even positive, then merely changing Vpp should not make it negative. Or some sort of boundary setting. (edit, reading back, I realize you were saying the same)
Tiny update from my side