Page 1 of 4
Simple Gadgets you can build DIY only
Posted: Mon Jul 05, 2021 5:21 pm
by Wonfor14
OK Nerds get soldering irons at the ready.
I am offering just for fun to draw and layout not to complex
analogue designs for you to build, that does mean no digital lies OK I said
NO DIGITAL LIES.
So put you idea up and lets see what we can do, have fun (I will he he)
It will keep my mine busy as my mobility is getting to be crap now, I and hate cabbages and brussels ,
Re: Simple Gadgets you can build DIY only
Posted: Mon Jul 05, 2021 5:43 pm
by Wonfor14
Not one of these please,
Re: Simple Gadgets you can build DIY only
Posted: Mon Jul 05, 2021 7:11 pm
by Daniel Quinn
Quartz mains regenerator lenco power supply
Re: Simple Gadgets you can build DIY only
Posted: Mon Jul 05, 2021 7:40 pm
by karatestu
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
Re: Simple Gadgets you can build DIY only
Posted: Mon Jul 05, 2021 9:50 pm
by Wonfor14
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
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 ?
Re: Simple Gadgets you can build DIY only
Posted: Mon Jul 05, 2021 9:53 pm
by Wonfor14
Daniel Quinn wrote: ↑Mon Jul 05, 2021 7:11 pm
Quartz mains regenerator lenco power supply
50Hz output and variable frequency and voltage range more info please.
Oh what waveform shape do you need SIN, SQUARE, TRIANGLE, STEPPED?
Re: Simple Gadgets you can build DIY only
Posted: Tue Jul 06, 2021 5:44 am
by karatestu
Wonfor14 wrote: ↑Mon Jul 05, 2021 9:50 pm
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
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 ?
Go on then Colin, you twisted my arm
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
Re: Simple Gadgets you can build DIY only
Posted: Tue Jul 06, 2021 10:39 am
by Daniel Quinn
Wonfor14 wrote: ↑Mon Jul 05, 2021 9:53 pm
Daniel Quinn wrote: ↑Mon Jul 05, 2021 7:11 pm
Quartz mains regenerator lenco power supply
50Hz output and variable frequency and voltage range more info please.
Oh what waveform shape do you need SIN, SQUARE, TRIANGLE, STEPPED?
Colin your asking pertinent questions that I will have to research the answers
Anybody can help it would gratefully appreciated.
Re: Simple Gadgets you can build DIY only
Posted: Tue Jul 06, 2021 11:07 am
by Daniel Quinn
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
Re: Simple Gadgets you can build DIY only
Posted: Tue Jul 06, 2021 1:31 pm
by Wonfor14
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
Well I did do one many years ago for Frazer of Oxford Acoustics But the divider chip is no longer made will investigate.
