Author Topic: The dual primary coil idea  (Read 3815 times)

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Re: The dual primary coil idea
« Reply #8 on: March 08, 2017, 02:54:53 am »
Good luck in your quest for discovery. Keep us posted if you try something.

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Re: The dual primary coil idea
« Reply #9 on: March 08, 2017, 09:45:55 am »
i worked at the schematic for the freq gen so far... now i need to do a pcb and build the test

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Re: The dual primary coil idea
« Reply #10 on: March 09, 2017, 20:37:40 pm »
today i got some ICs for this project... i got the lm219 and lm393 for the comparator part

for the timer i will use a ne555 i have many here..

for the driver i will use a ir4427 or a couple of tc4420

for the switch will be a couple of igbts 1200v capable of 15a

i will add Tvs in parallel with the coils for a voltage of 880v along with a diode and up to a current of 5 amps or more depending on what i have here available...
to increase the current ability of the tvs you just need to add more in parallel otherwise they simply explode and than the transistor burn right next...

usually i also have a resistor in parallel with the tvs around from 220 to 500 ohms high power and not soldered because solder melts with the resistor geting hot and all burns as well

I will set the coils like if i was designing for 5khz and so the circuit will go from maybe 2khz up to 16khz 3 octaves or less...


 


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Re: The dual primary coil idea
« Reply #11 on: March 14, 2017, 03:11:28 am »
ckt for it

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Re: The dual primary coil idea
« Reply #12 on: March 18, 2017, 23:48:00 pm »
i did this circuit 

the input voltage is 12v

for the timer part i used a 4.7k resistor in series with a 10k potentiometer 10nf capacitor..

on the comparator part i used a two 10kohm resistors connected respectively to the vcc ground and to a 10kohm potentiometer so its central tap output from 4 up to 8v 

basically i want to send the 555 timer ramp that goes from 1/3vcc to 2/3 vcc into the non inverting input of the comparator and sending a voltage to the inverting input within the same range for generating a couple of pulse width variable frequency signals


« Last Edit: March 22, 2017, 00:05:49 am by sebosfato »

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datasheet joke lm219j
« Reply #13 on: March 19, 2017, 01:05:46 am »
this datasheet is a *  joke

check the pin numbers it says the package i´m using have the 1,2,13,14 NC while the 1 and 2 is output and ground respectively

« Last Edit: March 22, 2017, 00:06:06 am by sebosfato »

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Re: The dual primary coil idea
« Reply #14 on: March 19, 2017, 09:42:01 am »
so you found the problem?

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Re: The dual primary coil idea
« Reply #15 on: March 19, 2017, 13:07:05 pm »
well i tried to find each datasheet for it and i found one only one that may have the answer...

it says if the voltage supply is higher than 9v the v- should not be tied to the ground... and its something i did... i will try to disconnect and see if it works

http://pdf.datasheetcatalog.com/datasheets/270/52732_DS.pdf