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Why rectify it?
Once you have a triangle wave you can feed it straight to a comparator circuit and compare it to a voltage adjustable above and below zero. The comparator output may go from +v to -v but you can use a diode to clip or clamp the negative side at the output if necessary.
Brian.
I refer you to:
https://forum.arduino.cc/t/use-arduino-webserver-with-sd-card/661436
To access it via WAN, I suggest you give it a fixed IP address first by binding the ESP32 MAC to some internal LAN IP address. You can see the MAC address by monitoring the serial output for the ESP32 as it...
...and if capacitors are needed you will need ones with the correct temperature coefficients to compensate for the crystal and DS1307 itself. Both will change characteristics with temperature. You will get some improvement by choosing capacitors that work in the opposite sense so they counteract...
Please define what you mean by LAN and WAN. ESP32 has WiFi, you can use it as an access point directly so you 'log in' to the actual ESP32 which acts as a web server -or- you can log the ESP32 into a wireless router to make it accessible to any device, including the internet, that the router...
Using a TL866 here with USB interface and "minipro" software under Linux. Programs just about everything, including EPROMs.
I've checked my stock and have lots of '256 EPROMs but none rated fast enough to replace the original ROM, if I had you could have one. I do have some stock elsewhere and...
If DeviousDexter is in my part of the World, direct sunlight is in short supply at the moment. It could take weeks.
If only EPROMs could be erased by rainfall.....
Brian.
The DS1307 is absolutely precise, always. It is just a counter circuit, some memory and some glue logic.
Time keeping tolerance is entirely controlled by external components, in particular the crystal. If you can find the crystal specification, the same tolerance will apply to the...
UV is the only way to erase them I'm afraid. Your picture shows one that has had a sticky label on it at some time so it probably has a program in it already so needs erasing before it can be used again.
The devices are still available from most suppliers and even from Ebay but if you buy a...
They are pin compatible and the EPROM has a slightly faster access time so it should work as a replacement.
Yes, it is UV erasable, the quartz window is to let light through to the silicon, after programming it is advisable to place a label over it to keep light out. I'm not sure what...
Nice to be mentioned in dispatches!
The other point Klaus didn't mention but is relevant at low voltages is how 'closed' the switch has to be. A triac will still drop around 0.6V when fully conducting and that could be significant. There are other possibilities that might work but more...
... but check the 'bias T' works over the bandwidth you need and can carry enough current.
Perhaps a simpler alternative is to simply add back to back Zeners in series with the motor so it doesn't operate until >12V is present then reverse the polarity to change motor direction. A bridge...
Easy with ICs, doable with discrete components.
You need a good RF isolation filter to keep the DC and RF apart, a 12V regulator to power the pre-amp and something to detect 15V and 24V. The voltage detectors could be say a 13V and 22V Zener diodes with pull-down resistors to ground and series...
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