Carl,Max,J Player etc etc

[sharky]

whats the slew rate of this noise less circuit from the site http://www.national.com/ms/LB/LB-52.pdf

Dont assume and dont think, say exact if u know, say the numeric figure....

[Etc.]

Some Read

Here is some help.

I can't think.

Therefore.

http://users.ece.gatech.edu/~lanterm...ors/AN-222.pdf

http://www.national.com/ms/LB/LB-19.pdf

Have a nice read.

[JC1]

0.775 nv/rtHz

Hey Sharky,

You read Application note 222? They have 0.775 nv/rtHz amp

in fig. 4, in fig 5 they have wideband 1MHz 2.0 nv/rtHz amp

don't know the slew rate, probably have to figure it out from

the other link I gave you. How far you planning on slewing

anyway?

[Carl-NC]

whats the slew rate of this noise less circuit...

Looks like 0.1V/us, good for audio.

[sharky]

Resistor element Break Down Voltage

Hey Sharky,

You read Application note 222? They have 0.775 nv/rtHz amp

in fig. 4, in fig 5 they have wideband 1MHz 2.0 nv/rtHz amp

don't know the slew rate, probably have to figure it out from

the other link I gave you. How far you planning on slewing

anyway?

Planning for 50v/us for PI....15V/us is insuffient and also the resistors 2 watt type MFR have an element breakdown of 200-400v we need a high element break down voltage

[JC1]

50 V/us

Hi Sharky,

Why 50 V/us ? that seems awful fast and very wideband

and very noisey because of wideband with.

Remember this is all per rtHz.

Also remember you can put resistors in series to get higher

and higher breakdown voltage on array. I often make large wattage

and high breakdown by series and parallel many 1/4 watt resistors

cause I don't want to wait to order and lazy and have lot of

1/4 watt metal film resistors around, and they get rid of heat

well this way as well. You can also follow the topology of the

circuits and use your own favorite lower noise transistor and build

your own amp.

[sharky]

Nice talk JC1

Hi Sharky,

Why 50 V/us ? that seems awful fast and very wideband

and very noisey because of wideband with.

Remember this is all per rtHz.

Also remember you can put resistors in series to get higher

and higher breakdown voltage on array. I often make large wattage

and high breakdown by series and parallel many 1/4 watt resistors

cause I don't want to wait to order and lazy and have lot of

1/4 watt metal film resistors around, and they get rid of heat

well this way as well. You can also follow the topology of the

circuits and use your own favorite lower noise transistor and build

your own amp.

Nice talk JC1, can u suggest a good PI, can i go for delta Pulse schematic in this site

[JC1]

sure

Hi Sharky,

I haven't built the Delta Pulse, but in reviewing the schematic it

looks O.K. to me. I like the DC restoration stuff in it.

The transmit current in the coil looks like it is only limited by the

the transmit period, inductance of coil, and DC resistance of coil.

Therefore with low inductance and low resistance could get some

very high transmit current, which is OK for detection but battery

may have to be large.