Post Created date
Efficiencies in Radio Amateur (2)
Regenerative definitely the way to go! Very simple to build and they perform very well. I enjoy building them with vacuum tubes, because I just have a “thing” for tubes 8)
Saturday, 29 February 2020 - 05:31
Mass fuel flow controllers for propane for example
White-Rogers makes a nice little modulating combination gas valve that directly takes pwm commands.
Thursday, 20 February 2020 - 22:59
Multi output Fly-back SMPS
I designed a five output flyback switcher, +5, 5 isolated, 5 isolated, +15 and -15 volts. The custom transformer secondaries were wound “quint-filar” (is that even a word?)....
Monday, 17 February 2020 - 09:12
ADC calibration for AC coupled inputs
With a simple high pass filter algorithm you can nullify any dc offsets, then you only need to calibrate for gain. What would be the lowest frequency you want to measure?
Thursday, 30 January 2020 - 07:24
sampling smal DC 0-40mV with Atmega8
You only need three things to implement accurate TC measurements:   1) A good chopper stabilized/zero drift op-amp, maybe spend as much as a dollar on it 8) 2) Cold...
Friday, 10 January 2020 - 19:59
Pin current consistency / atmega 4809
What an adorable display, Alan!  It's your stencil that really did the trick, good paste application usually yields a good result 8)
Tuesday, 17 September 2019 - 19:56
Pin current consistency / atmega 4809
That’s the busiest little board I’ve seen in a while! Nice work!
Tuesday, 3 September 2019 - 22:18
Raspberry Pi
There seems to be some way of doing real time tasks on a Pi.  I have a couple of them running Logitech Media Server, Kodi, and driving a stereo 24 bit dac via spi. Not...
Tuesday, 18 June 2019 - 18:23
I/O operating voltages between two ATMEGAs
If the chip is truly 5v tolerant then no problem.  You said two "atmegas", I'm just not familiar with any that are 5v tolerant, something new perhaps?
Wednesday, 12 June 2019 - 23:43
Who wants to write a Bootloader for ATMEGA32M1 and SPI EEPROM (job offer)
And... What usually happens when you try to remove a dip package with your fingers? There will be blood
Wednesday, 12 June 2019 - 23:03
I/O operating voltages between two ATMEGAs
The 3.3V should be OK with 5V input, that is, no need to level shifting or anything? Why should it be ok? (It is not) A read of the data sheet would be a good investment of your...
Wednesday, 12 June 2019 - 22:40
elevator programing code
I'd forget the 8th, Fire Department trucks can't reach above the 7th floor, anyway.
Sunday, 12 May 2019 - 06:05