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I've been using an Antex 15W soldering iron for all my little projects for the past 20 years or so, including 0402 smd componants. It's not easy but I seem to have the knack. However I've been looking on eBay for a semi-pro smd solder station as a replacement to make my life a little easier and...
Thanks Guys... Autopsy time...
I can see what I did now in the cold light of day with the aid of a scope. In trying to populate an unpopulated area of a PCB with an option I forgot to order, I wrongly identified a couple of surface mount pads and managed to switch places with the inductor and...
In particular a Murata NTE0515MC, I'm having a little problem...
I needed a 15V isolated supply to feed into a PWM speed controller for my lathe, so I got this one. I made up the circuit as per the instructions in the attached data sheet, quite simple, just a capacitor and an inductor, and...
I agree about the accuracy of the 555, if you're trying to keep it in sync with anything else not physically connected to it then forget it. componant % and temperature will make the frequency drift.
Forget the 555, use flash photography and clock a flipflop in toggle mode with a photo...
Run the 555 at a higher frequency, or better still, use a crystal clock oscillator with a decade counter to divide the frequency down to something useful, feed that output into the clock input of a toggling flipflop to give you your exact 50% duty cycle, not forgeting that every flipflop used...
It may not be the PSU that's at fault, I had a similar problem a few months ago and it turned out to be the motherboard connection to the PWR_ON# terminal that wasn't being grounded properly everytime. How often does the problem occur?
How about using a NOT gate and edge trigger the 555. Feed the inverted input signal from the NOT gates output, through a 0.001uF ceramic capacitor with a following pullup resistor. Or if you don't want to use a NOT gate, just a transistor would do the same thing.
**broken link removed**
I use my EP925 as a PSU to power my iMAX B6 Charger and any other circuit I make up for testing. Also anodising small aluminium parts sometimes. Though I didn't realise you wanted to go to such a low voltage with a high current.
If that's your want then maybe a converted computer ATX PSU would...
Well.... you could use one of these but... it would be far less expensive to buy a PSU with the correct voltage and current rating.
I use one of these that I bought at a local electronics store here in the UK for £80.00
A rotary phase inverter has a motor running all the time to make the 3 phase electricity, it uses a lot of electricity all the time it's on and it's noisey too. The one I suggested and use myself only uses electricity when your motor is turning and also allows a variable speed control of up to 2...
I'd thought about that. but the cost and extra complexity prohibited it, plus the fact I've never used one before so I wouldn't have a clue how to control it.
A 60A Silicon Controlled Bridge from RS is £40 and the 100W resistor only £9, I already had an SSR from a previous project but a Chinese...
After giving it a little trial run, I've downloaded the student level version that allows 90 days evaluation, I suggest you do the same, then make up your own mind about it. Looking good so far though.
Sounds like a good system and it obviously works well. Mine will be slightly different.
1. Short press on the power button - logic circuit on +5VSB sets ATX12V PSU PWR_ON to low, which in turn starts a 1 second timer.
2. When/If PWR_GOOD goes high in less than 1 second, logic powered by +5V...
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