Sorry for the late response. Been busy
. However:In LTSpice I believe R400, R401, R402, R403 are now 130kOhm? That would result in a filter frequency of ~26Hz. Fill in other values for R4xx and the frequency will change. If you follow the BOM, R4xx is composed of a 30k resistor plus the value of the potentiometer (0kOhm - 100kOhm). This will give you a range of 26Hz (@ 130kOhm) to 113Hz (@ 30kOhm). You can change the range for example from 24Hz to 85Hz by putting in 40kOhm resistors at R4xx.
In LTSpice you have to change the values of the R4xx resistors manually to change the crossover frequency. You can use the calculator at the bottom of the page of project 09 from Elliott Sound Products to easily calculate these values for any given crossover frequency.
Hope this helps!
Dear all,
I finished my build and got the sensing circuit working as well. Man, I'm glad everything works. Which brings me to the following:
The library part I used for the mosfet in the sensing circuit (Q1) has another pinout than the ZVN4210A part (and the BS170 and BS270 have yet another pinout). So you'll have to swap the pins. When looking at the silkscreen with the potentiometers at the bottom; the left pin is 'source', the middle pin 'drain' and the right pin 'gate'. So for the ZVN2410 you'll have to swap the middle and the right pin. The BS parts you'll have to put in the other way (turn them 180 degrees) and swap the same pins. So please have a good look at the pinout of the device you're using!
Another thing: Because the solder pads are small and the hole diameters are small as well, desoldering of parts is quite the challenge. So if you are not sure about component values (e.g. for the equalizer sections), I would recommend soldering in sockets to place your components. This prevents some frustation when you have to swap parts. These for example: 01-0513-11H Aries IC & Component Sockets
Happy soldering!
I finished my build and got the sensing circuit working as well. Man, I'm glad everything works
. Which brings me to the following:The library part I used for the mosfet in the sensing circuit (Q1) has another pinout than the ZVN4210A part (and the BS170 and BS270 have yet another pinout). So you'll have to swap the pins. When looking at the silkscreen with the potentiometers at the bottom; the left pin is 'source', the middle pin 'drain' and the right pin 'gate'. So for the ZVN2410 you'll have to swap the middle and the right pin. The BS parts you'll have to put in the other way (turn them 180 degrees) and swap the same pins. So please have a good look at the pinout of the device you're using!
Another thing: Because the solder pads are small and the hole diameters are small as well, desoldering of parts is quite the challenge. So if you are not sure about component values (e.g. for the equalizer sections), I would recommend soldering in sockets to place your components. This prevents some frustation when you have to swap parts. These for example: 01-0513-11H Aries IC & Component Sockets
Happy soldering!
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And one other thing:
The momentary switch to release the relay in the sensing circuit (S2) is designed for a 'toggle' type momentary switch (switching between two poles). The part I'm using (and is in the BOM) is a single pole however. To make this work just solder a bridge (or connect another way) between pole 2 and 3 (middle and right pins viewed from the top). Don't forget to do this, otherwise the circuit will never release automatically.
The momentary switch to release the relay in the sensing circuit (S2) is designed for a 'toggle' type momentary switch (switching between two poles). The part I'm using (and is in the BOM) is a single pole however. To make this work just solder a bridge (or connect another way) between pole 2 and 3 (middle and right pins viewed from the top). Don't forget to do this, otherwise the circuit will never release automatically.
There are no hole numbers on the silk screen, my apologies for this. You can have a look at the schematic. When not using S3; connect 1+2 and 4+5 for a 0-180 degrees section and connect 2+3 and 5+6 for a 180-360 degrees section. Looking with the potmeters at the 'bottom' and silkscreen on top:
1=top right
2=middle right
3=bottom right
4=top left
5=middle left
6=bottom left
Dear Mfy,
I will use you PCB together with a king of servo control. I won t need the LT boost.
Woudl it be OK to bypass it by connecting the ouput of the equalizer to the input of the phase shifting section (R700 and switch) ?
Shall I also bypass the rumble filter or is it fine to let in enabled ?
Thanks
Akira
I will use you PCB together with a king of servo control. I won t need the LT boost.
Woudl it be OK to bypass it by connecting the ouput of the equalizer to the input of the phase shifting section (R700 and switch) ?
Shall I also bypass the rumble filter or is it fine to let in enabled ?
Thanks
Akira
No problem to bypass the LT boost the way you describe. Rumble filter is fine to let it enabled. However, in most cases it's not essential. It becomes more essential when using the LT boost.
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