Italian pulse detector Nuova-elettronica-245

[6666]

Exactly.

Thats very clever , I did not know you could do that, thanks.

[MDfanatic]

Nice work but what about the power supply? The power supply circuit is very crucial to the whole design and that's why I dropped it in the first place.
I mean it's already super-hard to find some parts and yet they complicate the design even further with components that were almost obsolete at the moment this magazine was issued. WHY?!

[6666]

the board finished i checked it unless i missed something should be correct according to schematic.

https://gofile.io/d/DUaKF5

Fast work.

[6666]

Nice work but what about the power supply? The power supply circuit is very crucial to the whole design and that's why I dropped it in the first place.
I mean it's already super-hard to find some parts and yet they complicate the design even further with components that were almost obsolete at the moment this magazine was issued. WHY?!

Six 18650 battery's will fix that. or 8 and a couple of regs

[MDfanatic]

If you notice on the PDF you will see that there are 2 basic boards, the main board and the power supply board. The power supply board converts to ADC and supplies the main board.
Besides that, the main circuit board has +12V/-12V/GND which are all critical for the circuit operation.

[6666]

If you notice on the PDF you will see that there are 2 basic boards, the main board and the power supply board. The power supply board converts to ADC and supplies the main board.
Besides that, the main circuit board has +12V/-12V/GND which are all critical for the circuit operation.

Yes the power pcb steps the 4-6 volts up to +-12volt, but you dont need a complicated inverter circuit to get +- 12v,replace with 18650 cells and problem fixed. Just dont buy any with the word fire in the name

[dom44]

I am going to experiment with a CFL light bulb transformer have many dead ones around the MC34063 is easy to use i have quite a few around in my parts box just need to work out the turns ratio should not be that hard, R5 and R6 set the output voltage on pin 5 of the chip I have started the board main coil driver oscillator works and gives exactly 64 Hz after IC2b narrow needle pulses and the audio oscillator works fine to.

[MDfanatic]

So your idea would be to connect +12V and -12V? And what about the GND?
Or even if you connect +12V and GND, what about the -12V? You have to leave either one unconnected which would make the circuit useless.

[6666]

So your idea would be to connect +12V and -12V? And what about the GND?
Or even if you connect +12V and GND, what about the -12V? You have to leave either one unconnected which would make the circuit useless.

Like this.

And this with regs just adjust the battery voltage, easy peasy.


So for a quick +- 12v supply just centre tap 6 18650 cells
for regulated +- 12v supply just centre tap 8 cells and add regs

[MDfanatic]

Looks like I'm more Australian than you because 5 months ago I first learned how to read a schematic and design a PCB and after read about electronics
I still have a sh**load to learn it seems. Thank you for your precious help and input!

[dom44]

here is an easy way to get +12v and -12v from 5 or six volts if you don't want to make it

https://www.aliexpress.com/item/32982612833.html?spm=a2g0o.productlist.0.0.792141a 39Y1N4w&algo_pvid=1024eeb6-bd9b-4690-bfe5-b57355f2feec&algo_expid=1024eeb6-bd9b-4690-bfe5-b57355f2feec-19&btsid=0bb0623e16075812721348518e224f&ws_ab_test =searchweb0_0,searchweb201602_,searchweb201603_


https://www.aliexpress.com/item/3281...%2315615%23668

[bernte_one]

or a combination board with
7812
7912
7805
7905
and some buffer cap

so 4x 18650 would do the job (4*4V = 16V and some room for the voltage drop of 2,5V for the 7812)

[6666]

here is an easy way to get +12v and -12v from 5 or six volts if you don't want to make it

https://www.aliexpress.com/item/32982612833.html?spm=a2g0o.productlist.0.0.792141a 39Y1N4w&algo_pvid=1024eeb6-bd9b-4690-bfe5-b57355f2feec&algo_expid=1024eeb6-bd9b-4690-bfe5-b57355f2feec-19&btsid=0bb0623e16075812721348518e224f&ws_ab_test =searchweb0_0,searchweb201602_,searchweb201603_


https://www.aliexpress.com/item/3281...%2315615%23668

Could work if you can keep the noise down, may need some OS-CON caps on outputs