Electronics

All electronics related. For finer selection go for sub-categories.

LTSpice Parameter Sweep

While designing/ working on my APRS project, I used LTSpice IV for some simulations. For those that don’t know, LTspice IV is a high performance SPICE simulator, schematic capture and waveform viewer from Linear Technology. It is a freeware and can be downloaded from this link. Versions for my both platforms exist, Win 7.0 and Mac. […]

Staedler pens

Red and Green

This will be a very short post. And only for the blog. I have a sweet spot (call it idiosyncrasy) for stationery. I mean, some people do heroin, some do alcohol, some do Oprah. I am addicted to stationery. Put me in a stationery shop — you can leave me there all day (give or take), […]

APRS Proto - 3

144.8 Mhz TX for APRS (3)

This is a quick update post. The road I took with this little project is slowly getting to a dead end due to what it seems to be a lack of available crystals for 144.8 (like 48.26 or 28.96 MHz, for using the third or fifth harmonic). I believe that, currently, all APRS modules are […]

144.8 Mhz TX for APRS (2)

More work today and yesterday on this project. Still locking on 144 MHz, but this is normal, the crystal I used is a 48 MHz overtoned, working on the third harmonic in this case, thus spot on 144.0 MHz: I managed to clean the output, at the expense of transmitted power. I used a 7-pole 2m bandpass […]

144.8 Mhz for my APRS Beacon project

144.8 Mhz TX for APRS

Been busy at work lately, but still had some time for myself. Latest idea: a low-cost APRS beacon, done with a classical 144.8 Mhz TX and a μController. AX.25 on air. Automatically. So these days I’ve been busy making this: Winding coils, soldering, measuring. Fun. The frequency is remarkable stable, given the rudimentary nature of this. For example, […]

The Indestructible LDMOS

Mailbag today 2 ! This time from NXP. OMFG, look what I got ! This baby will definitely end up in a power RF amplifier for my Ham Radio fun time. This will be a project. THANK YOU NXP ! Got them both today ! And I have to tell you, the girls and guys […]

Toshiba TRL330 RF Choke

Scavenging for electronic parts

Not very often I have the occasion to salvage some good parts from throw–away devices. Two days ago I found an empty TV set carcass lying on the sidewalk with some pieces left. The rest was — probably — savagely ripped off for copper and some other metals. It’s a bit of shame to see […]

Stuff to read

This is very, very short. Books I have to read. But I really, really have to read: Art of electronics book Art of electronics student book Masterminds of programming

AVRISP mkII unboxing

AVRISP mkII

Until recently I have extensively used my MacBook, AVRDude and USBTiny for my μController projects: Now I got myself a proper tool, the AVRISP markII, mostly because I wanted to use AVRStudio 6.0 features: Key features: Programs both flash and EEPROM Supports fuses and lock bit programming Upgradeable for future device support Supports target voltages from […]

JFET Circuit Analysis – great tutorials on YouTube

Looking for some detailed information about JFET circuit analysis, I ran today into three excellent videos posted by Bournemouth University. Already subscribed to them. The videos are part of Linear and Switching Circuits Series and target the following topics: Performing the DC JFET circuit analysis of a simple JFET self-bias amplifier (to find the circuit […]

Power MOSFET

Understanding Power MOSFET data sheet parameters

Fabulous piece of literature from NXP (here’s the link to a cool pdf). Nothing beats a well written material. So it seems that I have some very interesting thing to do this evening: printing this and have a good read. This comes on perfect timing for my MOSFET dummy load project ! Quoting from NXP’s material: […]

Dummy Load Prototype – breadboard closeup, view from above; detail;

Dummy Load Prototype – 2

Next steps for my dummy load prototype based on IRF830 N-Channel MOSFET, and a LM328 plus a multi turn pot.

Weller WD 1000M Review

There are good tools and poor tools. Weller WD 1000 M is a state-of-art quality instrument that looks good, feels good, has a plethora of gimmicks and is a pleasure to work with. Let’s find out some more about my new soldering station.

MAX17058, MAX17059: 1-Cell/2-Cell Li+ ModelGauge ICs

The MAX17058/MAX17059 ICs are tiny fuel gauges for lithium-ion (Li+) batteries in handheld and portable equipment. The MAX17058 operates with a single Li+ cell and the MAX17059 with two Li+ cells in series…

Dummy Load Prototype – breadboard closeup, view from above;

Dummy Load Prototype

Started a new project inspired by here, here (polish) and here. Currently assessing using IRF830 for the N-Channel MOSFET component of the design.

OpAmps for Everyone

A very thorough and useful reference produced by Ron Mancini at Texas Instruments. A must read for anyone takes OpAmps seriously: “OpAmps for Everyone”

Agilent DSOX 2002A

Finally arrived !

I just got it few days ago, a superb brand new Agilent 2002A Digital Storage Oscilloscope. Needless to say that I am absolutely thrilled by this 2G/s 70Mhz baby. It is a perfect addition for my electronics projects. Now I am playing with it, much to discover in the documentation. It comes with a CD […]