VDI-LED

[eduardo1979]

Hi all. I redesigned the IDX-PRO VDI and I replaced the LCD for 8 LEDS. The modification works quite well, there is no difference. I will post here the schematic and video of my modification. The scheme is slightly modified and do not know if that's OK. I want your opinions. I would like to simplify the scheme, because it has too many components and do not know if it would be possible. It is a very promising project and quite enjoyable. Thanks in advance. Greetings.
https://www.youtube.com/watch?v=O0HWXUI7uU0
VDI-LED.rar

[Davor]

How much current it draws in this configuration?

[eduardo1979]

Here is all very well explained. This project is based on my modification.
I hope that together we will be able to simplify and improve the project.

[Davor]

I see. My approach would be to go from a low power consumption 4 quadrant analogue divider circuit with compression (to convert tan -> arctan) and use any kind of display at hand, preferably an instrument with dial.
As ancillary benefit of this approach I could use the target ID signal to drive a VCO for audio representation of the targets. That could be interesting.

[eduardo1979]

I see. My approach would be to go from a low power consumption 4 quadrant analogue divider circuit with compression (to convert tan -> arctan) and use any kind of display at hand, preferably an instrument with dial.
As ancillary benefit of this approach I could use the target ID signal to drive a VCO for audio representation of the targets. That could be interesting.

Using a 4024 I think it would be possible to make it multi-tone detector. I think coupling the outputs of the LED outputs 4024 through 4148 diodes and transistors, the work would be ready. Become a detector 8 tones and 8 LEDs. It's an idea.

[Jerry]

Using a 4024 I think it would be possible to make it multi-tone detector. I think coupling the outputs of the LED outputs 4024 through 4148 diodes and transistors, the work would be ready. Become a detector 8 tones and 8 LEDs. It's an idea.

I like the multi-tone idea. In fact 8 tones might be a little much, you could reduce the parts count with just four. One additional idea, include trim pots in the voltage divider so you can tweak the tone break points a little.

Jerry

[eduardo1979]

That would be great. 8 shades I also think too, but I'd settle with 4 tones. If queremes only 4 tones and 4 LEDs, then the scheme would be cut in half and require fewer components. In this case we have to change the values of the voltage divider to include into 4 blocks all types of metal.

[Davor]

If you cut a bit further and go for 3 tones, we are speaking of IGSL
Even without VDI it works great.

In a paper by Miller, G. A. "The magical number seven, plus or minus two: Some limits on our capacity for processing information" it is recognised that human perception is somewhat limited and more than 7 distinctive properties are hardly ever recognised per any human sense. The hearing sense is a bit more generous here as it provides for some additional features simultaneously, and that very reason is why I insist on property-rich sound in a detector. Proportional loudness and stuff.

The most important thing is to reduce confusion, and let our senses sort out what is hidden in the ground. There is no substitute for that. 8 tones - why not?! But more than that only promotes confusion.

[eduardo1979]

VDI-4TONES

I think I found the solution. See What's this? I replaced the resistors precision voltage divider by 3 trimeres. I think it would be a good option to regulate the input voltages to our liking. I used the CD4040 as a sound generator. The outputs I have randomly selected. The question is to mount the circuit and do practice with until you get the desired 4 tones. Take a look. Greetings.

[Davor]

Interesting solution, but it must be simulated, or tested, with a realistic dynamic span of the targets response.