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Arduino based LDR volume and source selection controller
Arduino based LDR volume and source selection controller
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Old 31st January 2016, 03:45 PM   #151
maxw is offline maxw  United Kingdom
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Location: Berlin
Arduino based LDR volume and source selection controller
Quote:
Originally Posted by tfboy View Post
Maybe this is linked to what I wonder may be strange voltage levels coming out of the ULN2003? I get around 11.4V when logic high (maybe 0.6V is dropped from the diodes inside the IC), but around 0.5V for a logic low. Does this look right? MCP23008 logic levels are OK.
You lose some voltage to the ULN2003. In my designs usually around 1.1V. I think this is called saturation voltage and is detailed in the datasheet.
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Old 3rd February 2016, 08:28 AM   #152
MadKid is offline MadKid  Hong Kong
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Dear Vincent,

I had problem sourcing 5LN01SP on Farnell. Do you recommend other parts instead? What characteristic should I look into with MOSFET in this position?

Thanks,

Ken
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Old 3rd February 2016, 09:25 AM   #153
wineds is offline wineds  Australia
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Quote:
Originally Posted by MadKid View Post
Dear Vincent,

I had problem sourcing 5LN01SP on Farnell. Do you recommend other parts instead? What characteristic should I look into with MOSFET in this position?

Thanks,

Ken
I got mine from rs components but moq is 50 :

5LN01SP-AC | ON Semiconductor 5LN01SP-AC N-channel MOSFET Transistor, 0.1 A, 50 V, 3-Pin SPA | ON Semiconductor
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Old 3rd February 2016, 10:30 AM   #154
lydlaug is offline lydlaug  Norway
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Join Date: Nov 2004
Location: Stavanger
Arduino based LDR volume and source selection controller
Hi
I got a recommendation to use 2N7000_D26Z from Farnell, but this is not an equivalent, but it might work?
Did you find any Rotary encoder from Farnell? For this they recommend PEC1 but I haven`t checked it out.
reg
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Old 3rd February 2016, 12:39 PM   #155
Vincent77 is offline Vincent77  Europe
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Quote:
Originally Posted by MadKid View Post
Dear Vincent,

I had problem sourcing 5LN01SP on Farnell. Do you recommend other parts instead? What characteristic should I look into with MOSFET in this position?

Thanks,

Ken
Hello Ken,

The resistors around the mosfet are calculated for this model, so using another type may result in lower precision.
The characteristics we want here is a low Vgs(th).

5LN01SP are available at Mouser, who can ship globally.

Cheers,
Vincent
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Old 3rd February 2016, 01:07 PM   #156
lydlaug is offline lydlaug  Norway
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Arduino based LDR volume and source selection controller
Quote:
Originally Posted by Vincent77 View Post
Hello Ken,

The resistors around the mosfet are calculated for this model, so using another type may result in lower precision.
The characteristics we want here is a low Vgs(th).

5LN01SP are available at Mouser, who can ship globally.

Cheers,
Vincent
Hi, Vincent

A comment to that is that it's convenient to order all components from the same supplier to save shipping costs. And Farnell seems to have most of the components at a reasonable price, (at least in Norway) with the exception of the 5LN01SP and the Rotary Encoder.
Do you know of any replacement for this components?

Thanks & regards
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Old 3rd February 2016, 07:14 PM   #157
recepky is offline recepky  Turkey
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Hi Vincent
Is anybody with limited electronic knowledge (limited to use of soldering iron) can achive success in this project? Or can you provide and sell ready to solder pcb and parts as a kit? I want to make an LDR passive preamp and your project seems very promising for me with adjustable input and output impedance. It will be very good to have this project as a kit with a simple guide that can be implemented by the people like me with very little knowledge

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Old 4th February 2016, 02:10 AM   #158
rbalu72 is offline rbalu72  India
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Quote:
Originally Posted by recepky View Post
Hi Vincent
Is anybody with limited electronic knowledge (limited to use of soldering iron) can achive success in this project? Or can you provide and sell ready to solder pcb and parts as a kit? I want to make an LDR passive preamp and your project seems very promising for me with adjustable input and output impedance. It will be very good to have this project as a kit with a simple guide that can be implemented by the people like me with very little knowledge

GT-I9500 cihazımdan Tapatalk kullanılarak gönderildi
The simple answer is Yes, if you have the PCBs made, this is relatively easy project to take up and complete.

Without PCBs, point to point soldering of these components could be challenging, otherwise this is a nice simple project where failure chances are less.

The zip file in Post#1 has everything needed to construct the project including how to prepare arduino nano unit as part of measurement and calibration of LDRs.

The key is PCB and availability of parts in your region. I got all my parts sourced from Mouser through a friend returning from US and I could construct the boards in couple of days. Am using this as a volume control alone at the moment and have not used other features of I/O boards. So one input and output in my setup.

Am not a hardcore electronic engineer but only an enthusiast with knowledge on identifying components, read data sheets, how to solder and know what am doing when am dealing with mains voltage.

Hope this helps.
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Old 4th February 2016, 08:06 AM   #159
tfboy is offline tfboy  United Kingdom
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I ordered the majority of components from Mouser. Being based in the UK, the order had to be around 50GBP to get free delivery, but as delivery was something like GBP15, then as soon as you get near 35, you might as well add a few more bits as they'll be offset with the shipping.

I ordered enough to make around 4-5 preamps, and thought it would be useful in case I blow anything up! Delivery from Mouser was very good for me - around 3 days coming from the US to the UK For the other bits, I ordered from Farnell or RS (things like the relays).

In the end, I re-did the PCB following the schematic as I wanted to lay things out a little differently and take on a good PCB Kicad exercise at the same time. I had a bunch of PCBs made by shenzhen2u.

I've put one together and it's working fine from bench measurements (although I'm yet to listen to it - must do that soon!). The only issues I came across were self-inflicted Follow the great guide Vincent put together and you'll be fine. A great project that doesn't involve fiddly / tricky / precision SMDs.
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Old 4th February 2016, 01:35 PM   #160
recepky is offline recepky  Turkey
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Join Date: Apr 2013
Location: Istanbul
Quote:
Originally Posted by rbalu72 View Post
The simple answer is Yes, if you have the PCBs made, this is relatively easy project to take up and complete.

Without PCBs, point to point soldering of these components could be challenging, otherwise this is a nice simple project where failure chances are less.

The zip file in Post#1 has everything needed to construct the project including how to prepare arduino nano unit as part of measurement and calibration of LDRs.

The key is PCB and availability of parts in your region. I got all my parts sourced from Mouser through a friend returning from US and I could construct the boards in couple of days. Am using this as a volume control alone at the moment and have not used other features of I/O boards. So one input and output in my setup.

Am not a hardcore electronic engineer but only an enthusiast with knowledge on identifying components, read data sheets, how to solder and know what am doing when am dealing with mains voltage.

Hope this helps.
Hey man thank you for the answer. Here in Turkey it is much easier to work with mouser electronics. For PCBs i will first try to work with local dealers. Now i am ready to order parts. Thank you for the help.

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