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It appears that I am ready for retirement.....

Goggle thinks that I am over the hill.

Your categories
Below you can review the interests and inferred demographics that Google has associated with your cookie. You can remove or edit these at any time.
Arts & Entertainment - Music & Audio - Radio
Computers & Electronics - Electronics & Electrical - Data Sheets & Electronics Reference
Internet & Telecom - Communications Equipment - Radio Equipment
Law & Government - Public Safety - Security Products & Services
Reference - General Reference - Calculators & Reference Tools

Your demographics
We infer your age and gender based on the websites you've visited. You can remove or edit these at any time.
Age: 55-64
Gender: Male

How did I find this?  I heard something on Public Radio yesterday while I was in the car. So of course I googled the info and found:

If you go there it will show your info and give you a change to change some of it.

So how did Google do:
  • I like movies and music
  • I am a professional IT Architect and amateur Electrical Engineer
  • I spend time looking at Internet & telecom related items and I am an amateur radio operator
  • I like guns and visit the target range on a regular basis
  • I use online electrical calculators for projects & do a lot of online research
  • I am not 55-64... I am 39.
I would say that they had it about 83% correct. From a marketing point of view they completely blew my demo because they were ~20 years off the mark on my age.  --I have a couple of years before I need to think about AARP membership, but thanks for the thought Google.

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Amplifiers at the workbench

I decided to go back and revisit a simple Class AB amplifier circuit based upon an NPN and PNP bipolar junction transistor that I worked on a couple of weeks ago. I am not sure what happened but I lost the magic and was not able to reproduce the gain in the circuit. <sigh>

After a bunch of messing around I grabbed a prototype Class A amplifier circuit board that I built back in February 2010. (It is even on an etched board)

The circuit is not very efficient since I am using about 190mA of current @ 12vdc. It is very much a Class A circuit with small signal parts but it has some gain. (The extra resistors are tweaks that I made 20 months ago to tweak the bias.)

If current is not a concern then this is generating 250-400mW of power with the RF drive that I would expect from a AD9851 DDS. Since I am using plastic NPN parts I have a heatsink on the final transistor (it was pretty warm to the touch.)

When time permits I will need to come back and design a new set of gain stages that are more efficient. Class A is a simple but expensive way to generator power. I need to think about Class B or Class C stages.

73 de NG0R