TESORO GOLDEN SABRE

[Max]

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.

Hi,
I've posted before some small and easy schematics for them using lm317.

This is a bit off-topic here so I'm posting a new thread in "general electronics".

Kind regards,
Max

[simonbaker]

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

Yes - LM2930T-8.0 was in earlier TGS schematic (one with notch) -- that is good also.

Eclipse - your 9.6 v battery pack should be OK with one of these low dropout regulators. Just seems like a waste to use 12 v to get 8 v with rechargeables my opinion. That is assuming you have enough milliamps either way.

[simonbaker]

R47, R55 with TGSL1265

More questions on R47, R55:

TGS schematic with notch does not have R47, R55 seen in TGSL1265 schematic.

Ivconic PCB not have R47, R55 either.

If no R47, R55, then what good is C24, R54? They won't work I think, not do any filtering -- C24 just follow output of LM393 and use power for no purpose (AC short to ground), maybe make power supply spikes when output flips too.

Am I misunderstanding?

What is best to do here?

Regards,

-SB

[simonbaker]

C20 -- wrong side?

C20 looked like in strange place to me at first -- why across battery instead of voltage regulator output?

I thought: maybe speaker causes spikes, want to smooth out.

Now I study Lobo schematics from Darko (page 68 of this thread). 220 uF capacitor is on output of regulator, not input.

In TGSL do we have C20 on wrong side of LM7808 regulator? It works, but is it best?

Regards,

-SB

[eclipse]

I did some changes on the board according to my components footprint,
and added the ground plane. There is only one connection b/w the gnd plane
and ground traces (left bottom) as Ivconic noticed thus will reduce noise.

But here is problem - the plane in the center of the board isnt connected,
so can i add some more connections (not just one, w/o worring from noise increase?)
or it's better the leave it this way

[simonbaker]

I did some changes on the board according to my components footprint,
and added the ground plane. There is only one connection b/w the gnd plane
and ground traces (left bottom) as Ivconic noticed thus will reduce noise.

But here is problem - the plane in the center of the board isnt connected,
so can i add some more connections (not just one, w/o worring from noise increase?)
or it's better the leave it this way

What software are you using? (it looks good)

-SB

[simonbaker]

More questions on R47, R55:

TGS schematic with notch does not have R47, R55 seen in TGSL1265 schematic.

Ivconic PCB not have R47, R55 either.

If no R47, R55, then what good is C24, R54? They won't work I think, not do any filtering -- C24 just follow output of LM393 and use power for no purpose (AC short to ground), maybe make power supply spikes when output flips too.

Am I misunderstanding?

What is best to do here?

Regards,

-SB

Ok, LM393 are open-collector outputs, so C24 charge slowly through R54 when both U106a and U106b outputs go high. Without R47, R55 , should discharge very quickly when outputs go low-- with R47, R55, discharge slower. So R47, R55 should affect audio somewhat. I'll try to experiment and find out.

-SB

[Molzar]

Eclipse,

I think connecting them would be benificial. But you still need to connect without making ground loops.

Looks nice, can you post the files on this PCB?

Molzar

[Max]

Ok, LM393 are open-collector outputs, so C24 charge slowly through R54 when both U106a and U106b outputs go high. Without R47, R55 , should discharge very quickly when outputs go low-- with R47, R55, discharge slower. So R47, R55 should affect audio somewhat. I'll try to experiment and find out.

-SB

Hi,
what schematic are you using ?

Kind regards,
Max

[eclipse]

Simonbaker, i am using spint layout
I added 3 new blocks (monostable, new auido stage and voltage monitoring circuit - i prefer visual led for low battery) on the board for testing purposes. changed layout and traces, added ground plane without loop, all new IC set, added 1K resistor, transistors now are BF245, all the rest - TO92, changed the PI-polar caps, all caps are with bigger footprint... called this mod Eclipse GS.
Will see for errors and order the board tomorrow, finally.

[ivconic]

Ok, LM393 are open-collector outputs, so C24 charge slowly through R54 when both U106a and U106b outputs go high. Without R47, R55 , should discharge very quickly when outputs go low-- with R47, R55, discharge slower. So R47, R55 should affect audio somewhat. I'll try to experiment and find out.

-SB

R54 presents output pull up resistor, must be there, as well as C24.

[ivconic]

More questions on R47, R55:

TGS schematic with notch does not have R47, R55 seen in TGSL1265 schematic.

Ivconic PCB not have R47, R55 either.

If no R47, R55, then what good is C24, R54? They won't work I think, not do any filtering -- C24 just follow output of LM393 and use power for no purpose (AC short to ground), maybe make power supply spikes when output flips too.

Am I misunderstanding?

What is best to do here?

Regards,

-SB

R47 is a part of battery testing, no relations with C24 and R54.
I included battery test in schematic and at some pcb's.
Sometimes i am using it on pcb, sometimes dont. Never mind at all.
C27,D13,TR10,R47 and R46 are all there when battery test is needed.
Otherwise you may omit those.
Personally i dont like this way of tesitng battery. Anoying 4-5 sec. audio.
So as i said, very often i am not using it on pcb's...
Who need battery test in case when 12V/1.3Ah accu is used, like i do almost always..

[simonbaker]

Hi,
what schematic are you using ?

Kind regards,
Max

Max, Ivconic - I am referring to schematic bundled in "TGSL-1265 Gift Pack.zip" which I believe was last one modified. I attached it here again.

R47 (and R55) in that schematic are 4k7 resistors from outputs of LM393 attaching to R54 and C24 -- they are not there on earlier schematic with battery test. I think they are also not on Ivconic's PCB for TGSL-1265 -- that's why I'm puzzled.

Thanks Ivconic for explanations, I understand better now that R54 makes pull-up for LM393. Would C24 make delay in pull-up? Is that to prevent small chatter? Maybe the 4k7 resistors slow the discharge of C24 to make audio tone last longer, and so are a good thing to have?

Regards,

-SB

[simonbaker]

Simonbaker, i am using spint layout
I added 3 new blocks (monostable, new auido stage and voltage monitoring circuit - i prefer visual led for low battery) on the board for testing purposes. changed layout and traces, added ground plane without loop, all new IC set, added 1K resistor, transistors now are BF245, all the rest - TO92, changed the PI-polar caps, all caps are with bigger footprint... called this mod Eclipse GS.
Will see for errors and order the board tomorrow, finally.

This is very good to have more different designs available for people with different parts, cases, etc. Somehow we need to bundle each in it's own "gift pack" with schematic and notes to keep them separate -- or we drown.

I'll be very interested in your reports as you test your design.

-SB

[driscoll]

Hi Guru's,
Hi IVCONIC,

I read your articles since the beginning and I think the GOLDEN SABRE looks increasingly SILVER SABRE.

I am wrong ?

Bests regards from France.