OK what input volts, what current how much space.?????karatestu wrote: ↑Tue Jul 06, 2021 5:44 amGo on then Colin, you twisted my armWonfor14 wrote: ↑Mon Jul 05, 2021 9:50 pmIt does but there is a few problems in the design, one being the VF of the LED ranges are from 1.4V - 1.8 in common use.karatestu wrote: ↑Mon Jul 05, 2021 7:40 pm Very kind of you Colin
How about a twist on the data sheet LM317 pre tracking reg like this with a gyrator / capacitance multiplier tacked on the front (not shown) using BC547 with 10K ohm resistor and 3.3uf film cap ? Oh and the option to set output voltage to 5V with two plain green LED's in series instead of R4 or a zener or a fixed reference like the LM329. Oh and the diagram doesn't have a cap across R4 or an output cap.
Would need positive and negative versions.
Does that make sense Colin
Second thought using a LM329 is wasted as the LM317 have a built ref voltage.
How about a shunt series reg psu instead, lower noise no voltage over shot, better ripple rejection ?
I have never used a shunt reg because 9f the wasted heat but being a Class A man Colin, it certainly doesn't seem to bother you
Simple Gadgets you can build DIY only
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Re: Simple Gadgets you can build DIY only
Input volts about 16 Vdc. Current no more than 50 mA. Size to fit in a cdp, 5V output ( sorry, digital lies)Wonfor14 wrote: ↑Tue Jul 06, 2021 1:32 pmOK what input volts, what current how much space.?????karatestu wrote: ↑Tue Jul 06, 2021 5:44 amGo on then Colin, you twisted my armWonfor14 wrote: ↑Mon Jul 05, 2021 9:50 pm
It does but there is a few problems in the design, one being the VF of the LED ranges are from 1.4V - 1.8 in common use.
Second thought using a LM329 is wasted as the LM317 have a built ref voltage.
How about a shunt series reg psu instead, lower noise no voltage over shot, better ripple rejection ?
I have never used a shunt reg because 9f the wasted heat but being a Class A man Colin, it certainly doesn't seem to bother you
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Re: Simple Gadgets you can build DIY only
Compact disk player?
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The psu has been bashed together I will put cct and PCB layout up soon, i did it leaded and single sided to save on pennies.
TT speed control 50HZ and variable output frequency and voltage waiting for bits, got Xtal already. Sorry some bit will be SMD (sand mud daft) type. And rats some digital lies cough spit puk eeeek Maria were is the EpiPens??
TT speed control 50HZ and variable output frequency and voltage waiting for bits, got Xtal already. Sorry some bit will be SMD (sand mud daft) type. And rats some digital lies cough spit puk eeeek Maria were is the EpiPens??
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Re: Simple Gadgets you can build DIY only
I made one years ago out of an old MP3 player reflashed to run rockbox with a custom oscillator plugin (source code on request). Plugged it into a stereo amp board, into some 230->12v transformers wired backwards and voila, a fully adjustable 2 phase crystal referenced AC PSU. It was a bit on the fussy side, but it worked well.Daniel Quinn wrote: ↑Tue Jul 06, 2021 11:07 am Voltage range would be for UK only , it's a motor powered by the mains so normally voltage range would be 230-250 v
The waveform it takes from mains voltage so I think its sine. The only one I know of uses a quartz crystal to produce a pure 50hz sine wave.
This may not be that simple 😂
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Re: Simple Gadgets you can build DIY only
I think you are overestimating my level of knowledge.
I'm a lawyer , my electronics knowledge is rudimentary.
I'm a lawyer , my electronics knowledge is rudimentary.
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Re: Simple Gadgets you can build DIY only
Very little electronics required. Customize MP3 player, plug into stereo amp, plug amp into 2 transformers, plug 2 transformers into synchronous motor. Fiddle with phase, frequency, amplitude, maybe even waveform shape.Daniel Quinn wrote: ↑Sat Jul 10, 2021 9:39 am I think you are overestimating my level of knowledge.
I'm a lawyer , my electronics knowledge is rudimentary.
The MP3 player plays samples at a rate of over 44ksps, so it's quite low noise and distortion compared to your typical CMOS or TTL referenced oscillator, no need to aggressively filter out harmonics. But as i said, fiddly.