PI 1

[Vasil]

Do need sinchonizotion between NE 555 and 7660?Need to insert rezistor between drein of IRF740 and coil /2....5 om/?

[Carl]

Re: PI 1

Synchronizing the voltage doubler and the main pulse is generally a good idea, and will minimize noise from the doubler coupling into the receiver. Some PI designs simply run a voltage doubler right off the pulse generator. I chose to keep things really simple and run the 7660 independently.

You probably don't need a resistor in series with the coil, as the coil should have enough resistance to limit the current. My coils run 5-7 ohms.

- Carl

[Vasil]

Re: PI 1

Thanks Carl ! I build PI 1 using NE5534. DO this project work good with 709?

[Carl]

Re: PI 1

Sorry, never tried a 709.

[Vasil]

Re: PI 1

OK . Whit NE5534 and LM 318 shematik work well.Do need twin loop for dificul ground, or only operate whit delay?

[Carl]

Re: PI 1

I've never tried a twin loop, though I suppose it wouldn't be terribly difficult to modify the circuit for one.

Also haven't tried a LM318, but I did design the PCB to accept one, since it is used on other designs. Right now, I've only tried the 5534, plus a couple of Analog Devices opamps.

- Carl

[Vasil]

Re: PI 1

HI! I think that transmit puls diraktion must have PWM pelation with power voltage.HH Vasil