TESORO GOLDEN SABRE

[Max]

I draw what I mean, do you think this is going to work?

Hi,
will work, even if I don't understand why using RH output stage there ?

It's good if you wanna exclude output influence on stability... cause filters better noise due to that part of circuit when using the speaker.

But you can do also on TGSL using the monostable mod...

Anyway, try it and let us know.

Kind regards,
Max

[simonbaker]

Hi,
1. it's not lock-in amplifier, you haven't critical integration there, but it's similar cause you mix reference and input signal of same frequency, then filter with a low pass: this filters out many noises but not very good... that's why you can get interferences in TGS from power lines, switching regulators etc. LF353 is a sensitive one... hi bandwidth. Can use different but seems it's good choice having one there instead of other stuff.

2. LM358 : uhm... is old good... but not so good, good replacements are possible and suggested... lower noise like TS27m7, they work better than LM358

3. LM308 : replacement possible... but worth ? I think not at now. Seems metal LM308 are the best there, for now.

4. LM393 : can replace but change few cause source of noise is not there, but early in the chain

5. TL062, avoid them at all. Use lower noise, even TL072 is fairly better.

Kind regards,
Max

Thanks that is helpful -- TS27m7 no found on google, but found LT1057 mentioned in same thread message, looks good too. This thread is like a book, needs an index!

Regards,
SB

P.S. J107 switches look like switching mixer of lock-in amp to me, but maybe we use different definitions.

[Molzar]

Sinon,

Maybe Max means TS27m2, ST Micro Op-amp?

http://www.st.com/stonline/books/pdf/docs/2306.pdf

Molzar

[simonbaker]

Actually simonbaker you are absolutely right for the 9V batteries!
There are NiMH GP batteries 200mA and i could find also 480mA ALCAXLINE (hard to get) LI ion. The difference in $ is big between those two but 200mA would not give more than 3 hours of work. Do you think i should remove 7808 in this case? Thus the device will drain the maximum power (~10V fully charged, and 7V discharged)?
And please if someone can, give more info on the resistors we mentionted here, can they be removed?
Cheers

I actually meant the 9.6 V battery packs for RC cars, etc. like this http://www.batteryspace.com/index.as...ROD&ProdID=776, should be good with low dropout voltage regulator like LM2941.

But interesting 9v battery is http://www.onlybatteries.com/showite...t1=14&uid=1970 because it is real 9 volts, 400 mAh. A little bigger size than normal though. I would like to use with my Compadre but probably won't fit miserly compartment. Like Max says a little wimpy for TGSL but interesting to try anyway -- I would use with LM2941 and try running TGSL at 7.5 volts, use thicker wire for TX coil to save power.

-SB

[simonbaker]

Sinon,

Maybe Max means TS27m2, ST Micro Op-amp?

http://www.st.com/stonline/books/pdf/docs/2306.pdf

Molzar

Ah, thanks!

[eclipse]

Today I made two battery packs - sizes like 9V battery,
consisting 4x1.2V NiMH, 750mA each pack, this will give me
around 11.5V-12V operating voltage fully charged. I will remove the 7808 and will place LM317 so I can adjust the output voltage (want to try with different voltages from 8V to 10V)

[simonbaker]

Today I made two battery packs - sizes like 9V battery,
consisting 4x1.2V NiMH, 750mA each pack, this will give me
around 11.5V-12V operating voltage fully charged. I will remove the 7808 and will place LM317 so I can adjust the output voltage (want to try with different voltages from 8V to 10V)

8 * 1.2 = 9.6, how get 12 v? Did you mean 5x1.2 packs?

Can anyone say what current TGSL draws normally?

Regards,

-SB

[eclipse]

nope not enough place for 10 batteries ( i am using 9V housing which can hold up to 4 cells 1.2V each) do you think the lower voltage will be a big problem?
fully charged 8 batteries can give around 11.5V .. ( 8 X 1.44V) enough power for the speaker, i suppose. it will go down to (10V when they are discharged)
Google can search better than the forum search, argh
so i found that its discussed - ~30mA w/o sound ~60mA with sound

[Max]

Sinon,

Maybe Max means TS27m2, ST Micro Op-amp?

http://www.st.com/stonline/books/pdf/docs/2306.pdf

Molzar

Hi,
I meant 27m7, though 27m2 is good also for the purpose and really more easy to find.

Here's TI page of it:
http://focus.ti.com/docs/prod/folder...t/tlc27m7.html

though STM made it too, at least I think so.

Kind regards,
Max

[Max]

8 * 1.2 = 9.6, how get 12 v? Did you mean 5x1.2 packs?

Can anyone say what current TGSL draws normally?

Regards,

-SB

Hi,
TGSL is not power hungry... requires 23-25mA when no sound, to power op amps etc

When it sounds the current depends much on your setup, including speaker type. When using headphones this is not an issue... cause consumption is few more than 25mA.

When setup is big draining speaker...using e.g. monostable... I saw also 200mA peaks there ! No good that way...I mean sound is like an horn in your ears but battery drain is TOO MUCH.

Usual safe, good limit is around 75-100mA.

In the 9V alkaline example , a duracell is around 500mAh so will last about 14.3 hours at 35mA average (considering it sound from time to time, when you switch on or locate targets).

Kind regards,
Max

[Max]

nope not enough place for 10 batteries ( i am using 9V housing which can hold up to 4 cells 1.2V each) do you think the lower voltage will be a big problem?
fully charged 8 batteries can give around 11.5V .. ( 8 X 1.44V) enough power for the speaker, i suppose. it will go down to (10V when they are discharged)
Google can search better than the forum search, argh
so i found that its discussed - ~30mA w/o sound ~60mA with sound

Hi,
well actually could be 30mA also: depends on components you use... but when on sound could be MUCH more than 60mA as I explained: depends on setup ...speaker etc

This of above is true for TGSL.

In TGS the no-sound consumption is about 10mA higher cause of the notch sub-system that's powered all the time.

You must also add about 5-6mA due to monostable operations, but you can disable it by switch and save battery when don't use or do not implement at all if not needed.

So, suppose you use TGSL+monostable expect currents at no sound of also 35-36mA , and much more when it sound.

That's why I suggest using at least 500mAh batteries... cause if you've a lucky day you'll drain totally a say 200mAh battery in really few time... do you understand me ?

Kind regards,
Max

[simonbaker]

Hi,
I meant 27m7, though 27m2 is good also for the purpose and really more easy to find.

Here's TI page of it:
http://focus.ti.com/docs/prod/folder...t/tlc27m7.html

though STM made it too, at least I think so.

Kind regards,
Max

Thanks, very valuable these alternatives, never know what parts available.

-SB

[simonbaker]

nope not enough place for 10 batteries ( i am using 9V housing which can hold up to 4 cells 1.2V each) do you think the lower voltage will be a big problem?
fully charged 8 batteries can give around 11.5V .. ( 8 X 1.44V) enough power for the speaker, i suppose. it will go down to (10V when they are discharged)
Google can search better than the forum search, argh
so i found that its discussed - ~30mA w/o sound ~60mA with sound

From looking at NiMH discharge curves, I think you should design for 9.6 even 9.4 volts low battery to really get the most from the batteries - 10 v cutting too close I think, leave too much energy in battery.

You can do it with lower dropout regulator. I look at spec, LM317 prob won't have enough headroom to work well, my opinion. I harp on LM2941, looks brilliant, but I only find as samples so far; of course, adjustable so need more parts. Maybe another type like it somewhere.

Cheers,

-SB

[Aziz]

Hi Simon and others,

LM317 is not convenient. To much drop-out voltage difference. LM2941 is good. LM2931 is also ok for max. 100 mA currents.

Aziz

[eclipse]

I gave up on using the battery holders. I had 2x9V battery housings, which i was going to use. I bought 10 x 1.2V MiMH smallest type I could find and was able to fit only 8 of them. So I made 12V pack, and I will use standard setup.
Too bad for the holders, they were fitting nice in the box.
--
Any good schematics for battery charger?
Next to do are the 2 coils.