Tesoro Lobo news

[homefire]

Prices here in the USA are on the High Side too.

Seems a single run board is about $30.00 to $40.00!

[Legaucho]

Hello all

My PCB is arriving from Beta-layout, I must work now.

I will keep you inform.
All the best

[joop]

Thanks for keeping us informed. I am also interested in building a Lobo.

[Legaucho]

Hello all,
Now some components on it, this is enough for today .

[homefire]

Looking good there!

[Legaucho]

Thanks "homefire", I don't miss this one, the copper path for this diode is below and the weld is well made, thanks again

[homefire]

That's cool.

It looks like the solder wicked up the others to the top pad.

Seen none on that one.

Your Da Man.

[amtech2005]

update:

I have started mine as a single sided circuit board . I am trying to keep mine just like the original .
Still have a ways to go but making "slow" forward progress !!

HH..............Eugene

[maxbiri]

Hi Legaucho

The pcb look very nice but i must advise you to change ceramic condensator, all condesators below 1000 pf must be poliester - polipropilene type with low temperatur drift.
If you want use ceramic type you need NP0 type.

bye Max

[Legaucho]

Thanks Maxbiri for your infos, if you look on the original Lobo PCB, the capacitors are basics.

Just for information on the use of capacitors. This information is taken from the book "component technology" by Rene Besson. capacitor type
Frequency ranges (min - max)
standard tolerance
use

Paper
d.c. - 1Mhz
+ / -20%
+ / -10%
Decoupling B.F., filters, power factor

Metallic paper
d.c. - 100Mhz
+ / -20%
Decoupling miniature connection BF, anti-parasite

Plastic
d.c. - 000Mhz 10
+ / -5%
+ / -1%
All uses, agreement circuits

Mica
1kHz - 10 000Mhz
+ / -1%
Agreement H.F. circuits, delay lines

Glass
1kHz - 10 000Mhz
+ / -1%
Mica replaces in all applications H.F.

Ceramic Group I
100Hz - 10 000MHz
+ / -5%
+ / -1%
HF power circuit, drift and HF agreement

Ceramic group II
1kHz - 200MHz
+ / -20%
Decoupling H.F.

Aluminium electrolytic
d.c. - 1kHz
-10% / +50%
Decoupling, filtering, linking transistors

Electrolytic Tantalum
d.c. - 10kHz
+ / -20%
Decoupling, filtering

All the best

[joop]

Don't forget plastic metal alloy capacitors, they all start with MK. Especially MKM capacitors have low temperature drift allthough they are a bit expensive. I use them the the TX circuit of the TGSL.

[Legaucho]

Hello all,

I have put all components on it.

All the best

[maxbiri]

Hi Legaucho

In original lobo photo i see precision capacitor and metal film 1% resistor.
Look at brown capacitor and resistor around rx stage.
Low thermal drift components, and low noise are important in rx stage and phase shift stage in other stage they aren't soo important.
I hope you will havent problems but if you note instability or noise you can try change that components.

Bye Maxbiri

[Legaucho]

Thank you maxbiri, for your clarification, must say that I am novice in pure electronics. I kept your info that I would not hesitate to apply if I meet some problems. again thank you and hope to read you.

[WM6]

Thank you maxbiri, for your clarification, must say that I am novice in pure electronics. I kept your info that I would not hesitate to apply if I meet some problems. again thank you and hope to read you.

Nice work, Legaucho, congratulations. Hope all will be OK in final step.