Audio question

[ivconic]

I think more description needed because just guessing game here ...

-SB

Ehhhh! As you maybe already noticed; i have huge problem when want something to explain and express here. Simply it is due my lightly English. I know descent English for everyday conversation, but when comes to speciallity terms and technical utterances than i am Tarzan, himself!
I usually void to try anything more complex to explain here simply cose of fears not to appear stupid and funny here!
My huge problem!

Dont laugh now, i will try to explain;

basic idea is to disengage channels and separatelly to process signals from them. Simply as that.
Why?
Take XP GoldMaxx Power, play a bit with it and you will see...
Maybe i am wrong...but as i remember Nautilus also have same feature? Or it was Wilson? Correct me if i am wrong, i am not sure at all..
But i dont like 2 speakers solution at all!

[ivconic]

Just for the record; today i got XP GoldMaxx Power on testing. I will return it tomorrow to owner.
It is hard to explain what kind of mighty beast it is!
Ok...let me remind you; my best TGSL detects 1e coin in air (on prepared bench) at 32cm distance, with 27cm DD coil.
XP Gold Maxx Power (18kHz) detects same 1e coin in same conditions at 44cm in air....BUT! With 22cm DD coil!

I am not sure about project itself. It is based on PIC16C77 uPc. But what i like much at it, is pretty good iron control at front panel.
I can only presume what is all about. Most probably i could make wrong conclusions. But looking at XP i got another idea - to disengage channels at some moderate project and to try to achieve maximum control on both channels separatelly. In speaker i want to hear quite separate vco tones, one near the other. Not NOR-ed but togather ...yet separated! The way i can hear those at XP...!

Ehhh...see! Tarzan spoked!

[Boattow]

Really confused

I don't think the problem here is your English, I think we don't understand exactly what you are trying to mix together. You stated originally you wanted to play 2 different audio sources out of one speaker. Then you show a digital NOR gate. This makes no sense. What exactly is the audio you want to combine to 1 speaker? Your first answer is the one that makes the most sense. Using a couple of resistors to mix the signals to the input of an amplifier. If you want something more complicated (can't figure out why though) you could use an op amp and build an active audio mixer.
Good luck,
Boattow

[Qiaozhi]

basic idea is to disengage channels and separatelly to process signals from them. Simply as that.
Why?
Take XP GoldMaxx Power, play a bit with it and you will see...
Maybe i am wrong...but as i remember Nautilus also have same feature? Or it was Wilson? Correct me if i am wrong, i am not sure at all..
But i dont like 2 speakers solution at all!

When I read the first sentence I instantly thought "Nautilus". This detector has two audio signals at the same time - in effect a non-motion and a motion detector working together. You can read more about it here -> http://www.nautilusmetaldetectors.co...tnautilus.html

[ivconic]

When I read the first sentence I instantly thought "Nautilus". This detector has two audio signals at the same time - in effect a non-motion and a motion detector working together. You can read more about it here -> http://www.nautilusmetaldetectors.co...tnautilus.html

Exactly! You got the point! But i want to use only one speaker. Now...simple mixing of two audio signals can also product sideffects, interferences, hums. I experienced that already. Problem is how to mix those and output to one speaker without sideffects....

[ivconic]

I don't think the problem here is your English, I think we don't understand exactly what you are trying to mix together. You stated originally you wanted to play 2 different audio sources out of one speaker. Then you show a digital NOR gate. This makes no sense. What exactly is the audio you want to combine to 1 speaker? Your first answer is the one that makes the most sense. Using a couple of resistors to mix the signals to the input of an amplifier. If you want something more complicated (can't figure out why though) you could use an op amp and build an active audio mixer.
Good luck,
Boattow

Yes i firstly had idea to use 2 NOR gates, but than i realized that it would be tough due signal levels i get to outputs of last opamps at both channels. To solve that i should add one stage more, which will complicate design to much and i am not really sure how good that soution would turn at the end.
Not good idea at all. I already said that in previous post.
....
Active audio mixer....yes that was the second idea i had. Will see....

[simonbaker]

Exactly! You got the point! But i want to use only one speaker. Now...simple mixing of two audio signals can also product sideffects, interferences, hums. I experienced that already. Problem is how to mix those and output to one speaker without sideffects....

It should not be so much problem as you think -- audio signals superimpose nicely as long as you don't saturate and "clip" in your audio amplifier. Look at the 16 channel mixers you can buy for recording studio -- just summing amps. No distortion.

Really, should be no side effects if amplifier is in linear region. The human ear separates them out -- just simple summing amp that Q referred to will work.

The trick is to keep the levels under control, don't saturate your audio amp.

So each signal is 1/2 max voltage swing of audio amp. Then when mix, no distortion.

Ear is logarithmic, so 1/2 voltage is still very loud.

It should work.

---------------

I looked at CL3 schematic (yours) for audio -- it looks like maybe a multivibrator using LM393 for audio tone??? You would need to maybe use flip-flop (divide by 2) or something to make another tone????


Kt315 schematic uses CD4020 for tone, so easy to get another tone with another set of diodes like I was thinking (but haven't tried).

I want to use second channel for different purpose -- slow recovery, so have fast recovery and slow recovery in same MD -- high tone for fast recovery channel (shallow targets), low tone for slow recovery channel (deep targets).

Nice to dream, need to prove I can make any MD first!

-SB

[ivconic]

It is not problem to generate any audio. I intend to put 2 separate VCO's going to separate buffers and ...ok...why not, to summing amp at the end..

[Rov]

This doesnt seem per the original post?My crystal ball has now become clouded?More Mud!Go your merry way!ivconic!
Sure the other spurts! will give you guidance.Sorry! these simple criteria does work? Your Bad!

[ivconic]

This doesnt seem per the original post?My crystal ball has now become clouded?More Mud!Go your merry way!ivconic!
Sure the other spurts! will give you guidance.Sorry! these simple criteria does work? Your Bad!

I really dont understand a word you are saying!?!?! Is that a slang?
Please repeat but more human, consider that i learned English just yesterday!
Thanks in advance!

[Rov]

Yes you do! an is not much slang! if you know this word!Good!
hope you achieve your outcome for 2 output into 1 speaker.is common knowledge for most!you will sort it out very quickly soon if you think?Thanks Regards !is not my Bad!
Simple!
Rov

[ivconic]

I still do not understand a word from you!??
Hey...never mind! Who cares!

[Rov]

Sorry you have such a communication gap! ivconic!
Man! so easy!freq, seperation to each cone from 2 channel,per your original post?Give you something .Yes /No to work with?Man this is simple Audio sep.technics.2 or Multi Channel...You the Guru? sort It?
for all?Regards Rov.

[ivconic]

???

[simonbaker]

I wonder if this is what Ivconic is thinking of with "multiplexer"... maybe interesting idea...

Imagine four time slots per cycle.

Tone 1 uses slots 1 and 3.

Tone 2 uses slot 4 (or 2), just one slot.

So... multiplexer samples channel-one voltage twice per cycle (slots 1 and 3), and samples channel-two voltage only once per cycle (slot 4).

When no voltage from channel, of course no pulse.

So basically two tones, each made of pulses (like TGSL tone), but never overlap.

I wonder what it would sound like? Would it be like two clean tones?

-SB