jippie

Eindhoven, Netherlands

wirespeed.xs4all.nl/mediawiki

Age: 45

Do you love your Pets as much as I do? Check the Q&A proposal!

I'm into:

  • Linux;
  • Networking;
  • IT Security;
  • Perl;
  • System integration;
  • Arduino;
  • ATtiny & ATmega Microcontrollers;
  • Analog electronics;
Jul
23
comment Silicon bugs, errata sheets
Backward compatibility. Developers may exploit a silicon bug whether it be consciously or not. The other day there was a question on this topic, someone got an old version controller and his program refused to work. Only after careful checks it turned out his device's part number lacked an extra trailing A. It turned out to be documented, but it does confuse people.
Jul
23
revised High Current Split Supply
deleted 157 characters in body
Jul
23
comment Difference between a controller (e.g PD) and a compensator(e.g Lead)?
What is a (e.g Lead) compensator, what is it used for, where did you see it mentioned?
Jul
23
comment Ubuntu Software to monitor current speed of serial port transfer?
€ stty -F /dev/ttyUSB0
Jul
22
comment How to measure telephone DTMF tones with an oscilloscope?
Are you connecting the two modems back to back without a phone exchange in the middle that applies the correct line voltages, dial and ring tones? Also what response do you get from the AT commands?
Jul
21
comment High voltage and low voltage sensing via the same pin
I was thinking an NPN common base, with emitter at !RESET, base at ~4V and collector at Psense, but that'd probably require some fiddl'ing with other values (R3 for example) too. But the transistor will probably break down and avalanche when you attach 12V.
Jul
20
comment How to reduce the voltage dropped in a mosfet used as a switch?
Are you sure the circuit you've seen before has the LED's at source side, rather than at drain side?
Jul
20
comment Transistor saw-tooth oscillator. Saturation issue using LTSpice
@RickvanLoo I think you have to find a balance between the programmed Q1 collector current (which depends on VC) and the resistor. Actually, it took me a minute to realize what your problem really is. You'll have to find a way to turn off Q3 which is probably less trivial than just adding a resistor. Not sure, I'd have to pull out a bread board, but I think I would experiment with a forth transistor or an entirely different architecture.
Jul
20
answered Transistor saw-tooth oscillator. Saturation issue using LTSpice
Jul
20
comment Slow slew-rate of photodiode circuit output
How did you size C6?
Jul
19
reviewed Approve suggested edit on J1 CPU problem, for get the variable value, I must read two times
Jul
19
comment switching power redundancy
@EMFields Yeah I did think of that, but then I realized 5A load would need a serious BFC and decided to skipt that remark. Say 5V drop at 5A during 1 second equals 1F if formulae-memory serves me right and the napkin calculations are correct.
Jul
19
comment switching power redundancy
I would personally use a relay that is powered by the primary PSU and switch the secondary PSU off/on with it. That way the secondary PSU doesn't draw any current while it isn't used anyway. Disadvantage is that you'll have a subsecond interruption.
Jul
19
comment How would I use a transistor to switch my DSL modem?
I use a master-slave power strip for exactly this purpose. When I switch on my PC, the modem and some other peripherals follow automatically. Then again, I didn't enjoy the fun of making it myself.
Jul
18
comment I want to energize a solenoid based on a temperature without arduino?
Are you familiar with comparators and hysteresis? en.wikipedia.org/wiki/Comparator for example eeweb.com/blog/extreme_circuits/temperature-controlled-switch
Jul
18
revised I want to energize a solenoid based on a temperature without arduino?
edited tags
Jul
18
revised Can't get AVR pin change interrupt to work
added 54 characters in body
Jul
18
comment Can't get AVR pin change interrupt to work
@Mervin Yes the datasheet implies that 4313 is identical to the 2313A version, apart from memory sizes.
Jul
18
comment Can't get AVR pin change interrupt to work
@Mervin And of course ensure you actually have a physical 2313A device.
Jul
18
comment Can't get AVR pin change interrupt to work
@Mervin You have to select the correct device in AtmelStudio. BTW: There is a version 6.2, but I don't know the differences with 6.1.
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