90479 Results for "《〈 문의 OIO↗5793↗7458 》〉 셔츠룸후기た《〈 문의 OIO↗5793↗7458 》〉 ⑷plenty㎋셔츠룸후기셔츠룸후기んteeth 셔츠룸후기선릉셔츠룸 강남셔츠룸￦셔츠룸ⓤsilverⓞ"

Driving the Display
Log from TI-57 Programmable Calculator Hardware Retrofit
The TI-57 has a multiplexed 12-digit common cathode LED display. The corresponding 8 segments of all 12 digits are connected together; sort of. It turns out that TI economized on IC package pins by ”doubling up” the decimal point segment...

Power Supply and Lid
Log from TI-57 Programmable Calculator Hardware Retrofit
Rcl57mcu wants a 3.5-5V supply. So, even if I could resurrect the dead BP-7 NiCd pack/lid, it won’t work for this upgrade. I will instead recycle the tried-and-true USB charged 3.7V LiPo supply that I’ve used for HP Classic, HP-28S, and TI-58/59 supply...

Diagrams
Log from Thurlby Thandar PSU repair

PSU #001, a PL320
Log from Thurlby Thandar PSU repair
Fault label: "Sparky".2024-03-01Opened case. Mains cable enters through grommet and is wired to the front-panel mains switch. There is no IEC filtered inlet.No sparking seen, even if wires poked with an insulated plastic rod (a Biro).Dials set to maximum,...

PSU #010, a PL320QMD
Log from Thurlby Thandar PSU repair
Fault label: "Numbers keep changing".2024-03-01Switched on, set dials to maximum. Leftt around 28.8V and drifiting, right around 32.88Dials set to minimum.Left side very slowly descends to 14.3 volts, terminals are at -0.424 volts.Right side slowly descends...

PSU #073, a PL154
Log from Thurlby Thandar PSU repair
Fault label: "Missing sense plate, wrong voltage". Suggested action: Check voltage entering digital meter chips.

PSU #075, a PL154
Log from Thurlby Thandar PSU repair
Fault label: "Current readout and limit vastly wrong". Suggested action: Check voltage entering digital meter chips.

PSU #077, a PL154
Log from Thurlby Thandar PSU repair
Fault label: "Faulty current limit". Suggested action: Check current sensing circuitry.

PSU #084, an EX1810R
Log from Thurlby Thandar PSU repair
This is a switch-mode PSU, so the mains is rectified to around 400 volts DC inside. Extra care is required to avoid touching this dangerous part of the PCB. Fault: Sparking at back of unit. Suspected cause: Faulty power connector or EMC capacitors. Examination:...

PSU #095, a CPX400SP
Log from Thurlby Thandar PSU repair
This is a switch-mode PSU, so the mains is rectified to around 400 volts DC inside. Extra care is required to avoid touching this dangerous part of the PCB. This can be remote controlled by GPIB, RS232, USB or Ethernet. The user manual is here: CPX400S+SA+SP_Instruction_Manual-Iss9.pdf...

Lightbulb Moment
Log from SolarEdge Meter
I have a Photovoltaic Solar Array on my roof, and as a nerd I just can't NOT know how it is doing up there. Bureaucracy being what it is, it was installed in the summer, and I didn't get Permission to Operate from the local electric company...

The Pico Fight
Log from SolarEdge Meter
Calling a Web Service isn't too difficult and with the SolarEdge documentation and Postman I was about to talk to the system right away. Really easy API Key based system. I would feed the same API calls into the Pi Pico W and it would scream about security....

ESP32 to the Rescue
Log from SolarEdge Meter
On a whim I decided to put a LILYGO T-Display S3 into the mix and see if it didn't behave better. The code shouldn't require a change between hardware platforms thanks to the hardware abstraction layer in the Arduino development platform.I hit upload...

There is no ESCAPE the Space
Log from SolarEdge Meter
I was having great success with the basic request for the current status. Things were working great. I wanted the 15 minute updated production history. This required a start date time and an end date time.Every time I attempted to call that API...

A bright and shiny toy.
Log from SolarEdge Meter
Done in a weekend. Finishing a project isn't a luxury I often get, and doing even a simple one in a weekend is nice. The source code can be found here: https://github.com/AardvarkMan/SolarMonitorI'll 3D print a case for it later, but from a code...

|<
<
6025
6026
6027
6028
6029
>
>|