good stuff! I was hoping to fit it all on a 100x160mm together with the shunts, let's see if that works out
Hi Riccardo
Grid spacing can be set to anithing you like.
Is in the units settings and you can change the snap mode to half grid or quarters or even up to 1/48
yes a tau is inch/100
but you can change that to on your units settings (you have option for 2 alternate Units)as most components (capacitors) spacing is metric.
Dig deep in the program it will let you create your own components and or modify existing ones and you could download componets library from RS.(If I remember a free program was on the same page as that download and let you import stuff from other design packages)
Is not that straight forward and I give up on it as I find easier to place the standard simbols on one layer and replace the pads with what I need in another layer and then tracks on that.
And Yes software is free to download from RS components is very similar to Easypc whic I had since it was DOS version and now cost about £350 (sic sic I could have bought a few new records instead) for the cheap and nasty one with even more very limited component library.
Grid spacing can be set to anithing you like.
Is in the units settings and you can change the snap mode to half grid or quarters or even up to 1/48
yes a tau is inch/100
but you can change that to on your units settings (you have option for 2 alternate Units)as most components (capacitors) spacing is metric.
Dig deep in the program it will let you create your own components and or modify existing ones and you could download componets library from RS.(If I remember a free program was on the same page as that download and let you import stuff from other design packages)
Is not that straight forward and I give up on it as I find easier to place the standard simbols on one layer and replace the pads with what I need in another layer and then tracks on that.
And Yes software is free to download from RS components is very similar to Easypc whic I had since it was DOS version and now cost about £350 (sic sic I could have bought a few new records instead) for the cheap and nasty one with even more very limited component library.
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Riccardo you are welcome.
I am realy enjoy watching this tread.
I have not done much latley New Job Crimbo caming up and freazing cold in the loft....
My tanks to you all for all your hard work
I am realy enjoy watching this tread.
I have not done much latley New Job Crimbo caming up and freazing cold in the loft....
My tanks to you all for all your hard work
component and schematic entry for the preamp finished at around 3:30am....now I need to find a heatsink, enter the shuntregs and start with a floorplan....
Here is the heatsink I found, with 75mm width (which would leave some room on both sides of the target size PCB) the heat resistance is 3.8K/W assuming free air flow, so I think we have a good safety margin. And it has roughly the same height as the Panasonic FM caps so that helps with mounting.
hope you like it ;-) cost is €3.69 at Buerklin
hope you like it ;-) cost is €3.69 at Buerklin
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Guys,
I have 100pcs BZX85C 6v2 in my stock - not exact match to our needs but still these may be of interest in scope of noise test.
Please drop me PM with mail address if you want them - I still can send the envelope before end of week for testing.
I have 100pcs BZX85C 6v2 in my stock - not exact match to our needs but still these may be of interest in scope of noise test.
Please drop me PM with mail address if you want them - I still can send the envelope before end of week for testing.
One thing we may have forgotten is the supply for the Servo amp, in spice I just run it on 24 V... but will that work in reality..??
Was it included in the 105mA? if not we may need to change the shunt current, from 160mA to 170mA.
For the power supply of the servo 2 resistors, 2 15V zeners and 2 33uF elco's will do. Calculate the resistors for 10mA, 1K will do.
What also works is supply the Opamp ( servo ) from a string of Leds. Say we want plus-minus 15V. We have to drop 9V. We can use 3 blue Leds in series with the Opamp supply.
I would then use two 33uF and one 0,.1uF from Pin 4 to 7.
I am fine with the other solutions too.
I would then use two 33uF and one 0,.1uF from Pin 4 to 7.
I am fine with the other solutions too.
