Comments for marek's microsite

Comment on Hantek DSO1062B / DSO1102B / DSO1202B vs. 5GS/s LeCroy Waverunner ;) by Marek Lewandowski

Marek Lewandowski — Wed, 11 Apr 2012 13:36:16 +0000

Hi Tinhead,
I know this hack, I have used it, however, as you said, the improvement of BW is not that significant, as the input stage is anyway limited to some 250MHz…

Thanks for input anyway!
Marek

Comment on Hantek DSO1062B / DSO1102B / DSO1202B vs. 5GS/s LeCroy Waverunner ;) by tinhead

tinhead — Sat, 07 Apr 2012 19:01:54 +0000

Hi Marek,

nice compare. Not sure if you know that, but there is a way to increase bw (actually improve RF response)
of these DSOs by a small backdoor.
If you create a file named

/tst

with this content

[filter] 50

and reboot your DSO the bandwidth filter will be set to 500MHz. Unfortunately the
total capacity of all these 8 ADCs connected together is not creating a low pass, so you will get
anyway only 250MHz -3db bw, but then the filter is not that sharp so a compare with LeCroy
should looks better.

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Marek Lewandowski

Marek Lewandowski — Tue, 27 Mar 2012 21:20:43 +0000

Die Maschine dürfte vom elektrischen her ziemlich identisch zu meiner sein, daher müsste der Umbau direkt machbar sein. Natürlich sind die Kabel anders gefärbt und es kann geringe Unterschiede geben, aber arg wird es nicht sein.
Gruß!
Marek

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Lenni

Lenni — Tue, 27 Mar 2012 11:31:06 +0000

Wenn das alles zusammen echt nur ca. 50€ kostet, reizt mich das auch. Meinst Du, ich kann das so auch bei meiner Gaggia New Baby Class 06 machen? Oder ist die Maschine grundsätzlich so verschieden zu Deiner ?

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Marek Lewandowski

Marek Lewandowski — Wed, 07 Mar 2012 06:17:19 +0000

While you can get away with 0.75mm² instead of 1.0mm², you need a 5-core cable to do the mod the way I did.

Marek

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Gerald

Gerald — Tue, 06 Mar 2012 22:16:01 +0000

@Marek

Thanks for the reply and warning…
but its ok I have a electronically sound friend who will assist me in this project I’m just trying to purchase the needed material before getting his help.

By the way, I was not able to find the Olflex wire your using all I can find is a 3 core Oliflex 0.75mm
would the thickness of the wire be enough?

here is the link to the item:

[instead of link: it's ÖLFLEX HEAT 180 SIHF 3G0.75, links to eBay expire 90 days after auction end]

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Al

Al — Tue, 06 Mar 2012 13:38:04 +0000

Thanks for the swift reply.
I’ll give that a go.

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Marek Lewandowski

Marek Lewandowski — Mon, 05 Mar 2012 18:56:10 +0000

BTW: you can do a simple test: mount the diode externally (rig up a set of batteries and a diode in series) and measure the actual voltage drop upon activating the meter. Do it on “normal” metering mode, not on the battery check (battery check draws more current AFAIR).
Marek

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Marek Lewandowski

Marek Lewandowski — Mon, 05 Mar 2012 18:54:24 +0000

The voltage drop across a diode depends on the current folwing through it. The meter draws a minute amount of power and so the voltage drop across a small-signal (thin and steep P-N junction) silicone diode will be less than 0.7V that a meter (testing at say 2mA) will show.

A 1N4148 should do. I don’t remember what exactly did I put in, sorry…

Marek

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Marek Lewandowski

Marek Lewandowski — Mon, 05 Mar 2012 18:48:56 +0000

@Gerald:
The indicator light has to be a 230V~ (AC) indicator light. A 5V one will burn – it might do it literally!
I dare say, that if you have to ask this question, it might be a dangerous for you to undertake the modification. Voltages present in a coffee machine present hazard for life and insufficient isolation or wiring errors may put the later operator at danger too!

Marek

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Gerald

Gerald — Mon, 05 Mar 2012 18:19:12 +0000

Hi, I just want to know what kind of indicator light did you use? I have a 3a , 5v red indicator light at the moment will this work on this?

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Al

Al — Mon, 05 Mar 2012 15:38:03 +0000

Hi,
You recommend any small diode. I have bags of 1N914 and 1N4148 Si diodes and have measured the voltage drop across a number of them and it is always in the region of 700mV. Should it not be closer to 400mV? Can you recommend a specific diode for the job, which did you use in the example posted above?
thanks.

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Marek Lewandowski

Marek Lewandowski — Wed, 25 Jan 2012 17:01:44 +0000

So, Gala,
wenn man den Umbau nicht macht, muss man “Temperatursurfen”, die Temperatur wandert auf und ab mit dem Originalthermostat. Inwiefern es sich auf den Geschmack auswirkt, hängt vom Kaffee ab.

Der Umbau hat um die 50€ gekostet, es ist schwer genau zu berechnen. Ich habe einige Teile einfach in der Schublade gehabt und einiges wiederum teuer eingekauft (z.B. Gehäuse vom Conrad).

Zeitlich war es ein ruhiger Nachmittag bzw. Abend. Je nach dem, wie fit man mit Werkzeug umgehen kann, nicht wahr?

Gruß!
Marek

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Gala

Gala — Tue, 24 Jan 2012 21:34:28 +0000

Hi Marek,
super Beschreibung. Was passiert denn, wenn man das nicht angeschaltet hat. Hat die Gaggia dann nach der Aufwärmzeit nicht eine “optimale” Temperatur, wenn man nicht Milch schäumt, sondern nur Espresso macht?
Sag mal, was hat das ganze denn in Summe gekostet?
Und wie viel Zeit hast Du investiert?

Schöne Grüße
Gala

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Marek Lewandowski

Marek Lewandowski — Wed, 11 Jan 2012 06:01:34 +0000

Hi Francesco

There isn’t any visible difference between a good shot with or without PID and it’s possible to obtain a good shot either way. It’s a bit more time consuming without, as you need to temperature-surf the machine. With PID it’s always ready (or at least you can see whether it’s ready).

My machine has an adjusted OPV, but it’s the former owner that did it.

Greets,
Marek

Comment on Alinco DJ-S45CQL (der große Bruder von DJ-S45CQS) oder wie ich an eine Funke gekommen bin… by Marek Lewandowski

Marek Lewandowski — Wed, 11 Jan 2012 05:58:27 +0000

Technisch wäre es möglich, man müsste aber den Ersatzakku um so eine Nase ergänzen, wie sie der Originale hat. Diese Nase legt in der Funke ein Schalter um, der das Laden erlaubt (sonst ist die Verbindung zum Lader elektrisch unterbrochen).

Marek

Comment on Alinco DJ-S45CQL (der große Bruder von DJ-S45CQS) oder wie ich an eine Funke gekommen bin… by Volker

Volker — Wed, 11 Jan 2012 00:43:11 +0000

Wirklich ein hilfreicher Bericht. Konntest Du den “Ersatz”CRV3-Akku mit dem originalen Tisch-Ladegerät von Alinco laden?

Comment on PID Anbaubox für eine Gaggia Baby ’77 by Francesco

Francesco — Tue, 10 Jan 2012 10:44:07 +0000

-English-
Your work is awesome, perfectly and carefully integrated into the machine. I rely on the google translation, since I do not speak german. Can you add a picture of the crema obtained with the PID in a ristretto shot, and a taste opinion?
An additional question is if you also adjusted the OPV (over pressure) valve to a slighly lower control pressure (10bar?) and if you have a device/gauge to measure the pressure.
I have the same machine (color white, 1979) and plan to go for PID temperature control and adding a pressure gauge in order to fine tune the pressure as well.
Thanks!
Francesco.

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Marek Lewandowski

Marek Lewandowski — Sun, 04 Dec 2011 10:41:09 +0000

It sounds right about the placement.
The frame that holds the mirror is soft, maybe it got deformed a little when it hit the floor?

Marek

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Randy Zauhar

Randy Zauhar — Sun, 04 Dec 2011 01:42:04 +0000

Hi, this is an excellent article.

I was not trying to adjust my meter’s calibration or deal with batteries, my meter was calibrated by QLM. However, some months ago I dropped the meter and it has been sticking, intermittently.

I disassembled the meter to see if I could find the trouble. Nothing obvious, and no bad behavior while the meter was apart.

UNFORTUNATELY, while I was screwing around the half-silvered mirror popped out. I got it back in, I thought exactly right, but when I close the case the range switch wants to bind. If I pull the case apart slightly, it works smoothly.

All I did was to put the lever arm through the hole in the corner, and swing the mirror part into its slot before closing the case. I oriented it so that the clear opening replaces the silvered side when in low-light mode, I assume that is right.

Any offhand advice would be greatly appreciated!

Randy

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Lukasz

Lukasz — Wed, 16 Nov 2011 17:07:48 +0000

I thought LD6806 only takes 1µA when is not doing anything and that current draw is 0.1-0.2mA :/
Also it would be possible to install additional switch to turn whole thing off, with that we could lengthen battery life to cuple months easily.

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Marek Lewandowski

Marek Lewandowski — Wed, 16 Nov 2011 16:43:02 +0000

LD6806 draws about 100µA by just sitting there, so your spanking new SR44 battery will be drained in 2000h or about 2 months.
LD6806 needs also about 1mA current draw for proper stabilization, so you need to add dummy load to Lunasix internal circuitry.
Otherwise the idea of an LDO crossed my mind, it was just not worth it… You anyway will need to calibrate the whole business.

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Lukasz

Lukasz — Wed, 16 Nov 2011 10:47:52 +0000

Hi Mark,
I was thinking about using LD6806 low dropout voltage regulator instead of your solution.
It’s possible to achieve stable 2,8V (I require 2×1,35V for lunasix) enclosed in one small simple circuit.
What do you think about voltage 2,8 instead of 2,7? should I look for something that gives me 2,6? or use LD6806 2,5V version?

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Mark

Mark — Mon, 26 Sep 2011 11:22:01 +0000

Your article is very much appreciated. I’ve tried re-calibrating my Luna Pro using silver oxide batteries, using only the trim-pots as suggested in the excellent article at
http://www.butkus.org/chinon/batt-adapt-us.pdf
However at least on my meter the trimmers don’t have *quite* the range needed to compensate for the much higher battery voltage. Installing a diode is a sensible and cheap solution to the dilemma.

Comment on Calibrating Gossen Lunasix 3 (LunaPro) by Marek Lewandowski

Marek Lewandowski — Tue, 05 Apr 2011 04:40:00 +0000

typical value is just that – typical. ldr sensors have a wide variation, so i wouldn’t write any off if it seems to work fine. it should calibrate anyway.
i’m typing on a cellphone, excuse briefness
greets
marek