The Tesoro "Eldorado"

[PegLegPenny]

Tesoro Eldorado Question!

Can I substitute a JFET 2N5486 (Package TO-92B) in place of the T1575, shown in several places on the Tesoro "Eldorado" schematic?

Im constructing this detector with "CircuitMaker 2000" and I don't have/cant find, the SPICE model or .lib file for the T1575.

Will the 2N5486 produce satisfactory results, with it's p25V, 30mA, 28.8 Ohm's?
Thanks Kindly,

PegLeg

[Unregistered]

It's a TIS75, not a TI575 which is probably why you can't find it.

Any FET of the same type will do here, but the Rds(on) has to be similar. using a lower Rds(on) won't make the machine more sensitive, what it does do is the opposite to a degree.

I've substituted VERY low Rds(0n) FET's in this location to no effect at all. Far better to scrap the primitive method Tesoro use and use a "Lock-in" amplifier instead (Google Don Lancaster's Hardware Guru). they glitch less and therefor allow higher aplification to be used in the later stages, thus givving better sensitivity and depth.

[Unregistered]

Thanks for the reply... I'll take that advice and see what happens on this EDA software. I'll also put on my eye glass next time ;-)

It's a TIS75, not a TI575 which is probably why you can't find it.

Any FET of the same type will do here, but the Rds(on) has to be similar. using a lower Rds(on) won't make the machine more sensitive, what it does do is the opposite to a degree.

I've substituted VERY low Rds(0n) FET's in this location to no effect at all. Far better to scrap the primitive method Tesoro use and use a "Lock-in" amplifier instead (Google Don Lancaster's Hardware Guru). they glitch less and therefor allow higher aplification to be used in the later stages, thus givving better sensitivity and depth.