@Voxxonline: have a look at the measurement-protocol that Uriah attached to the LDRs:
Both pairs are very well matched and you need not worry which pair to use as either Serial or Shunt pair.
You can do a final adjustment, if you like to: apply a constant DC-voltage to the input of both channels. A stable 5VDC would be nice, for example.
Measure the voltage of the output connectors of both channels and adjust by means of the potentiometer, if it is necessary.
Best regards - Rudi
Both pairs are very well matched and you need not worry which pair to use as either Serial or Shunt pair.
You can do a final adjustment, if you like to: apply a constant DC-voltage to the input of both channels. A stable 5VDC would be nice, for example.
Measure the voltage of the output connectors of both channels and adjust by means of the potentiometer, if it is necessary.
Best regards - Rudi
Ivan, any additional component (like a buffer, for example) in the music signal's wire will not improve the sound quality! On the contrary!
The line buffer's task is to drive an amplifier with low input impedance (< 20K) or to drive the signal over a long RCA cable.
You cannot use a 4.5V battery.
Your version of the VCPre has 2 onboard 7805 voltage regulators.
One is for the PIC µProcessor and the 5VDC analog voltage, the other one is to provide power to the motorized potentiometer.
A 7805 voltage regulator needs as least 7.5VDC as input voltage.
Please use a small EI38 print transformer rated at 7.5 - 9 VAC.
Best regards - Rudi
The line buffer's task is to drive an amplifier with low input impedance (< 20K) or to drive the signal over a long RCA cable.
You cannot use a 4.5V battery.
Your version of the VCPre has 2 onboard 7805 voltage regulators.
One is for the PIC µProcessor and the 5VDC analog voltage, the other one is to provide power to the motorized potentiometer.
A 7805 voltage regulator needs as least 7.5VDC as input voltage.
Please use a small EI38 print transformer rated at 7.5 - 9 VAC.
Best regards - Rudi
Versatile Pre BOM?
Rudi,
I'm just getting around to building the VCPre. It's next on my list of projects. Is there an 'official' BOM that calls out the component number and their value available. I did find one in the thread, but not sure if it's complete or blessed by you.
Thanks, Rick
Happy New Year too!
Rudi,
I'm just getting around to building the VCPre. It's next on my list of projects. Is there an 'official' BOM that calls out the component number and their value available. I did find one in the thread, but not sure if it's complete or blessed by you.
Thanks, Rick
Happy New Year too!
BOM
Does anyone have a text-based BOM that's simple enough to upload and attach to a message/post, or even paste into a post? I'm flying blind here trying to manually create a BOM from schematics and PCB layouts! I'd like to get an order in the mail for this projects and others ASAP. I'd rather not re-create the wheel if I don't have to.
Thanks in advance. - Rick
Does anyone have a text-based BOM that's simple enough to upload and attach to a message/post, or even paste into a post? I'm flying blind here trying to manually create a BOM from schematics and PCB layouts! I'd like to get an order in the mail for this projects and others ASAP. I'd rather not re-create the wheel if I don't have to.
Rick, the BoM has been deleted after some time of inactivity (?). I cannot access it either.
I remember that PALMITO did a Mouser-BoM.
Please ask him for his BoM.
I have attached a list of components created by the EAGLE layout software.
The components missing are: the LCD and the LM35 temperature sensors.
Best regards - Rudi
I remember that PALMITO did a Mouser-BoM.
Please ask him for his BoM.
I have attached a list of components created by the EAGLE layout software.
The components missing are: the LCD and the LM35 temperature sensors.
Best regards - Rudi
Attachments
Thanks so much for the info Rudi. - RickRick, the BoM has been deleted after some time of inactivity (?). I cannot access it either.
I remember that PALMITO did a Mouser-BoM.
Please ask him for his BoM.
I have attached a list of components created by the EAGLE layout software.
The components missing are: the LCD and the LM35 temperature sensors.
Best regards - Rudi
That Excel file in the zip was a BIG help once I converted it.
Last edited:
Sorry Rudi, I erased it a while ago while cleaning up my mouser.com account! I did reply to pm from Rick, but it seems you helped him out a lot more than I did!Rick, the BoM has been deleted after some time of inactivity (?). I cannot access it either.
I remember that PALMITO did a Mouser-BoM.
Please ask him for his BoM.
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