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Daniel Dancopy Fernandes
Daniel Dancopy Fernandes 4 hours ago
Hi, Bera! how are you? Did you get to try out the draft 4" TFT Analog-GPS clock on Arduino? It's been a while since I tried to use it with the Display 3.5 inch ILI9488 with esp8266 Nodemcu or esp32 but it did not work (showed some errors). Have you tried or updated the sketch for ESP? You told me about these other two projects: Youtube link1 & Youtube link2 but, I prefer the 4" TFT Analog-GPS clock on Arduino. If you have something updated and you want to send me, I thank you. If you prefer, my email is: meuviolino@hotmail.com Note1: I have both 3.2 inch ILI9341 and 3.5 inch ILI9488. Note2: I had sent you, attached, the photo of my display: TFT ili9488 3.5" (1.6 MB) - I think you did not see it. Thank you very much, Daniel Fernandes
4” TFT Analog-GPS clock on Arduino
Thomas Bunge
Thomas Bunge 7 hours ago
Upto ~200V the ADC reading and the actual voltage at the terminals follows the selected voltage accurately (some program tweaking was required accounting for component tolerances). That’s why I decided not to mess with the DAC (would require a non-linear adjustment function). I can select 400V output and will actually get 393V max. output (ADC reading and at the terminals). My main goal was to get the ADC reading accurately inline with the voltage at the terminals over the whole range of voltage supply within +- 0.5% accuracy.
HV Power supply with tube and semiconductor curve tracer
mfc
mfc 1 day ago
Agreed.   An update from me -- I ordered a second MEMS microphone BoB and with this one the setting of P2 worked as expected (albeit only changing behaviour at about one turn above 0).  However, with this second microphone board  (and a third which I wanted to put on a longer lead) I did not add the decoupling capacitor on the microphone board. So my current hypothesis is that the MEMS board with decoupling capacitor is just "not noisy enough" for the P2 setup to work .   I'm just off on a trip where I'll be using the detector in caves, but when I get back in a few weeks I'll try adding the decoupling capacitor to the 'working' MEMS board and see how that affects the circuit. Very many thanks to all who posted here, and to Ken Horton who suggested getting a second MEMS board.   At present I have a device that works as described in the article. Hmm .. wonder if a Rev3 might be in order?  Single-rail op-amps to avoid the need for level shifting; maybe more done in software;  maybe stereo .... ?  
Bat detector with amplitude recovery
Elektro Maker
Elektro Maker 1 day ago
To have a MIDI IN compatible with older 3.5mm jack interfaces, leave off D1 (BAT54) and solder an H11L1M piggybacked on IC1 (H11L1MS) with pins 1 and 2 swapped (pin 4 is an open collector output).
MIDI I/O Break-out Board [190070]
TonGiesberts
TonGiesberts 1 day ago
RF Power Meter (mother board) -bare PCB (160193-2)https://www.elektor.com/rf-power-meter-mother-board-bare-pcb-160193-2   RF Power Meter (RF front-end board) - module (160193-91)https://www.elektor.com/rf-power-meter-rf-front-end-board-module   or instead of the front-end module RF Power Meter (RF front-end board) - bare PCBhttps://www.elektor.com/rf-power-meter-rf-front-end-board-bare-pcb   and all part as listed in the BOM in the article RF Power Meter For measurements up to 10 GHzhttps://www.elektormagazine.com/magazine/elektor-201803/41378 Here the software needed for the Arduino Nano can be downloaded. You have to program the Arduino Nano yourself!  
RF Power Meter with seperate RF break-out-board [160193]