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Selecting a zener diode for solenoid flyback suppression
Fast fly-back diode is better solution. If you need faster switch off, add some small value resistor in series with fly-back diode. You may also consider to put something like low...
Wednesday, 14 November 2018 - 22:38
Brainstorm for a high resolution, high speed, synchronous rpm sensor
If you want an average velocity of the shaft, why do you need to count time between every tooth? Is the "separate system" able to correct rotation speed at that rate? Just count...
Tuesday, 16 October 2018 - 20:53
Help with troubleshooting PCB with MPU6050 and ATmega328
Hmm..  missing VLOGIC voltage level to pin 8? Trace goes to C17 but is not connected to any "power" supply.
Monday, 25 June 2018 - 18:34
Comparator Follower Circuit
If you need create just a "dead zone" for the joystick and you don't need exactly 0.25V, you may consider just use diodes. Schottky diode has about 0.2V drop across it and...
Friday, 15 June 2018 - 15:38
Comparator Follower Circuit
Did it even works? Maybe I'm wrong but if there is e.g 1V at pot U1A+ > U1A-. So there is 5V at U1A output that goes (for what ever reason) into inverting amp that clamps it to...
Friday, 15 June 2018 - 13:06
Comparator Follower Circuit
You can do it simple with just one comparator and one resistor. Comparator MUST have a open collector output like lm393. When Vi > Vref output transistor is closed so Vo will...
Wednesday, 13 June 2018 - 21:36
Learning more useful knowledge about electronics
There is a pretty good seminar for analog electronic / signal processing. https://www.youtube.com/playlist... https://www.youtube.com/playlist... but you will need to work a hard...
Monday, 12 February 2018 - 22:29
how to find phase reversal condition in three phase ac signals?
You can use something like 3 zero crossing detector / comparator one for each phase. Then you can measure the time between triggering to see if you have delay you like. And also...
Tuesday, 30 January 2018 - 21:47
russian semiconductor convertion
Isn't it same as KT3102E? Some alternatives: https://alltransistors.com/crsea...
Sunday, 14 January 2018 - 22:35
electrolock not being switched by transistor BD911
You should not expect Hfe as 35. It is very unstable non-constant parameter. BD911 datasheet says it fluctuate somewhere between 5 - 250 dependenig on Ib, Ice, Vce, temperature,...
Thursday, 14 December 2017 - 08:13
Servo SG90 not working correctly
How did you get it run on 8MHz? Did you set "divide by 8" fuse? Because there is a internal clock prescaler /8 enabled be default. So your timing may be wrong.  
Tuesday, 28 November 2017 - 08:34
Transistor arrangement?
Its voltage inverter. Inverts negative -27V to positive about 26V without load. Its tricky to think in negative voltages.   Suppose C2 is discharged.  If that logic-...
Thursday, 23 November 2017 - 22:49