Hi *,
I bought the LC30 two weeks ago. In my eyes mechanical and optical a very well done device but for me it has two issues:
I decided to develop an add on prototype PCB which I mounted into the box. There is much space inside so my additional prototype PCB nicely fits in there. It uses two AD8310 devices (used it as I never worked with it before and was curious) to create a real logarithmic output. Also I added some other components to be able to exactly calibrate the meters.
As I‘m not able to solder the tiny AD8310 I bought two of these PCBs, and mounted them on top of my breadboard. I had to modify them a bit to work with audio frequencies but this was quite straight forward.
With two potentiometers I’m now able to calibrate the 0dB and the -40dB levels at 1000Hz. After calibration the levels in between also fit. Only drawback is that the scale of the meters above 0dB is not logarithmic. So the values shown above 0dB are wrong. A damping resistor across the meter establishes critical damping so I get only a very small overshoot from pulses.
I‘m very happy now with this solution 🙂
I also integrated a NE555 and a small DIL Relais that simulates pressing the power button after 5V from USB comes up.
If someone is interested I offer to draw the schematics and publish it here. I also made some fotos during my work that I’m also willing to share. Maybe someone with skills in PCB layouting and producing will kick in and build a circuit board equipped with components so others also can upgrade their unit.
I uploaded the schematics and Fotos of my implementation in the Audiosciencereview thread of the LC30. Please follow the link for more information...
https://audiosciencereview.com/foru...speaker-amp-switcher-meter.57415/post-2270108
Best DrCWO
I bought the LC30 two weeks ago. In my eyes mechanical and optical a very well done device but for me it has two issues:
- It does not self power on if 5V comes up via USB. Would like to see a jumper inside where this could be configured.
- The display is uncalibrated. Nearly no movement at low levels and the meter swings much too fast.
I decided to develop an add on prototype PCB which I mounted into the box. There is much space inside so my additional prototype PCB nicely fits in there. It uses two AD8310 devices (used it as I never worked with it before and was curious) to create a real logarithmic output. Also I added some other components to be able to exactly calibrate the meters.
As I‘m not able to solder the tiny AD8310 I bought two of these PCBs, and mounted them on top of my breadboard. I had to modify them a bit to work with audio frequencies but this was quite straight forward.
With two potentiometers I’m now able to calibrate the 0dB and the -40dB levels at 1000Hz. After calibration the levels in between also fit. Only drawback is that the scale of the meters above 0dB is not logarithmic. So the values shown above 0dB are wrong. A damping resistor across the meter establishes critical damping so I get only a very small overshoot from pulses.
I‘m very happy now with this solution 🙂
I also integrated a NE555 and a small DIL Relais that simulates pressing the power button after 5V from USB comes up.
If someone is interested I offer to draw the schematics and publish it here. I also made some fotos during my work that I’m also willing to share. Maybe someone with skills in PCB layouting and producing will kick in and build a circuit board equipped with components so others also can upgrade their unit.
I uploaded the schematics and Fotos of my implementation in the Audiosciencereview thread of the LC30. Please follow the link for more information...
https://audiosciencereview.com/foru...speaker-amp-switcher-meter.57415/post-2270108
Best DrCWO