SSLV1.1 builds & fairy tales

[kffern]

It takes to replace it. Still, you never know if something else got tortured during the high current situation. The CCS MOSFET for instance. All leds must shine first and the voltage drop across the setting resistor should indicate a roughly expected level of CCS current. One step at a time.

Hi Salas,Nezbleu,
I have replaced the LED and used a 100ohm test load.
All the LED are on and I get a steady 19.2V after a minute or 2. Starts at 19.4 approx. I measure 2.4 ohm across R101 and it still gets pretty warm after a few minutes. Still don't read much across R108.
Regards,
kffern

 

[Salas]

Maybe 2.4 Volt? That means 615mA across a 3.9R. Its plenty hot-rod. Negative thermal drift until equilibrium is also correct result, since its a designed in feature to avoid any danger for border rail spec load circuits during the warm up. R108 should read few mV. 80-150mV maybe.

 

[kinku]

Salas ,what should be the resistor value I should choose for R101 for v out 5 and 1 Amp.Input 11V.Or can you please tell me how to calculate?
Using IRF9610 and IRF9530

 

[Salas]

With four green Leds a 1.8R 5W should hit the ballpark.

P.S. There is an XLS calc sheet to download in post #1 here.

 

[kinku]

sorry I am using SSLV1.1 board forget to mention that
for 5V pdf file reads
5V Vout Mosfet reg. 2 1.9V LED, 220 Ohm R303. Other parts jumper.
So will it change the value R101?

 

[Salas]

You are in the correct builds thread then. Those values you mentioned are to set the 5V out parallel part. Four greens and 1.8R R101 is for the CCS current section to allow about 1A. Your load's max demand must be known not to challenge that limit, and to leave a little spare from that for the reg to consume for itself.

 

[kinku]

I am using the XLS calc now. Is there any modifications I need to do in the calculations?

 

[kffern]

Maybe 2.4 Volt? That means 615mA across a 3.9R. Its plenty hot-rod. Negative thermal drift until equilibrium is also correct result, since its a designed in feature to avoid any danger for border rail spec load circuits during the warm up. R108 should read few mV. 80-150mV maybe.

Thanks for your help Salas. Much appreciated.
It is 2.4 V and R108 does measure 0.14V (non autoranging multimeter )
I might change out the cement insulated R101 for a better one.

To confirm: the outputs to the buffer should be 2 x twisted wires from F+/S+ for +ve and another for 0/0 for -ve?

Thanks,
Kffern

 

[AndrewT]

.................To confirm: the outputs to the buffer should be 2 x twisted wires from F+/S+ for +ve and another for 0/0 for -ve?..............

No.
The force (power) exit as a twisted pair.
The sense exit as a twisted pair.
Both pairs should be as short as possible.
it is always better to have the regulator beside, or on top/below of the load.

 

[Salas]

I am using the XLS calc now. Is there any modifications I need to do in the calculations?

Measure your Leds Vf with 9V battery and 3.3k in series. Enter those values instead of the nominal ones found in the calc. To enhance the predictions accuracy.

 

[Algar_emi]

The 2SK117GR seems impossible to find from legitimate source. Any replacement through-hole or smd recommended?
Thanks
SB

 

[alexkosha]

The 2SK117GR seems impossible to find from legitimate source. Any replacement through-hole or smd recommended?
Thanks
SB

http://www.amazon.com/2SK117-2SK117GR-N-Channel-14mA-transistor/dp/B00KHMOT2Q

 

[AndrewT]

10 pcs of 2SK117 2SK117GR N-Channel 50V 14mA the transistor - - Amazon.com

Clever or fraudulent photography?

Why don't they show the printed side of the device?

 

[Salas]

2SK880GR SMD is a replacement

 

[Algar_emi]

Thanks. SB

 

[alexkosha]

Clever or fraudulent photography?

Why don't they show the printed side of the device?

I sent short email to Omega (supplier) via Amazon and asked about 100% built proof of guaranty for authenticity. Let’s see what they are going to answer. But, I do not thing that Amazon monster might allow to someone to sell some fake staff.

 

[AndrewT]

I'll offer a worthless guarantee, that Amazon don't bother checking what gets sold under their banner, until after the lawyers force them to do the "moral" thing for the few they get caught at.

 

[alexkosha]

I'll offer a worthless guarantee, that Amazon don't bother checking what gets sold under their banner, until after the lawyers force them to do the "moral" thing for the few they get caught at.

Two live concepts:
a. I trust people
b. “Trust no one”
Which one to use is individual’s preference. I personally did not see any issue with fake products on Amazon.

 

[arezzo]

Hello Salas.
I turn to a power supply of 18,5V to power the clock XO2.2 of tentlabs.
* My question is: I measured the circuit and consumes 180mA. With that current range I calculate the SLV1.1 mosfet ¿250mA?
** Thanks and greetings from Spain ...

 

[merlin el mago]

What regulator are you using Reflektor or BiB?

BiB it enhances the performance 70-150mA excess on top of max load demand is usual practice for normal operation.