Friday Free Board Quiz – the prize is Soldering Iron – Resonant circuits

CHN-SLD802

CHN-SLD802 is low cost soldering iron with temperature regulator.

You can win this soldering iron! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question

The Quiz question is: In a RLC series resonant circuit the voltage on the Capacitor leads is 10V the voltage on Inductor leads is 10V and the voltage on Resistor leads is 5V. What is the value of the source voltage which drive this RLC circuit?

You have time to re-tweet and/or answer until Monday 21th of March.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

 

Quiz answer

superuser-superhero

Removing superuser/root from Linux seems pointless, but interesting job.

The question sure was not defined well for purpose, I didn’t want to restrain your ideas.

Removing su and sudo from /etc/bin was my first guess when one asked me about this, but other interesting answers like to change root password with “sudo passwd -dl root” was something new for me.

Random.org picked our winner, see you next Friday!

Friday Free Board Quiz – the prize is BB-CH340T – How to disable superuser rights in Linux?

BB-CH340T-1

BB-CH340T is USB to serial converter made for breadboarding as replacement of the FDTI nasty devices

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question

The Quiz question is: How to disable root/superuser rights in Linux? (and please do not try this on your computer :D)

You have time to re-tweet and/or answer until Monday 7th of March.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

P.S. Last weekend we got note that someone made several fake accounts and re-tweet other people answers. C’mon guys the idea of this Quiz is to provoke you thinking and learn stuff which you may not know. Please do not spoil the idea, we had Weekend Programming Challenge before with the same goals and there were hundreds of peoples who participated without any prizes just because it was cool. For the quiz we traditionally started with prizes and will continue, but please do not cheat! LEARN and google research things you do not know, just reading other people answers is not good!

Friday Free Board Quiz – the prize is A20-OLinuXino-LIME – Crystal Resonators Load Capacitors

a20-olinuxino-lime-1

A20-OLinuXino-LIME is our popular Linux OSHW computer.

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question :)

The Quiz question is: How load capacittors are calculated for crystal resonator which operates in serirs resonance?

You have time to re-tweet and/or answer until Monday 29nd of February.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

Friday Free Board Quiz – prize is PIC32-EMZ64 board – Which type capacitor is better to use in RF circuit C0G or NP0?

PIC32-EMZ64

PIC32-EMZ64 is board which we will give away next week at Embedded World to the pre-registered developers.

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question :)

The Quiz question is: Which type capacitor is better to use in RF circuit C0G or NP0?

You have time to re-tweet and/or answer until Monday 22nd of February.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

Friday Free Board Quiz – the prize is ESP8266-EVB and the question is: what is the size of 0603 capacitor?

ESP8266-EVB

ESP8266-EVB is open source hardware WiFi board which you can program with Arduino IDE and connect things to Internet.

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question :)

The Quiz question is: What is the size of 0603 capacitor?

You have time to re-tweet and/or answer until Monday 15th of February.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

Friday Free Board Quiz – the prize is RT5350F-OLinuXino – Is there anything wrong with this circuit?

RT5350F-OLinuXino-1

RT5350F-OLinuXino is OSHW board which run openWRT Linux distribution and have WiFi.

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question :)

The Quiz question is: Is there anything wrong with this circuit?

SCHEMATIC

You have time to re-tweet and/or answer until Monday 1st of February.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

Quiz Answer: There is no standard 17K resistor in any tolerance :)

resistor-color-chart

17K value doesn’t existi in any tolerance So no such standard color code 🙂

It was fun to see how such easy question can mislead so many people!

Friday Free Board Quiz – the prize is iMX233-OLinuXino-NANO+i – What is the color code of 17 K ohm resistor?

iMX233-OLinuXino-NANO-1

iMX233-OLinuXino-NANO+i is open source hardware linux computer with industrial temperature range -25+85C.

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question :)

The Quiz question is: What is the color code for 17 Kohm resistor?

You have time to re-tweet and/or answer until Monday 25th of January.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

Friday Free Board Quiz – the prize is A20-OLinuXino-LIME

A20-OLinuXino-LIME-1

A20-OLinuXino-LIME is Open Source Hardware Linux board, it has native Ethernet, native HDMI, two USB hosts, USB-OTG and native SATA . Build in LiPo charger and DCDC step up allow to LIME to work on simple LiPo battery while keeping all peripherials like Ethernet, SATA, USB powered by the battery which makes it perfect for small home server.

You can win this board! To participate in the Quiz is enough to re-tweet the Twitter Quiz announcement message.

To double your chances you have to answer the Quiz question :)

The Quiz question is: What makes one project OSHW?

You have time to re-tweet and/or answer until Monday 11th of January.

In Monday we will post the correct answer and ask random.org to generate random number in range then announce the winner and ship the board by post/airmail.

Good Luck!

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