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I had some time over the weekend so I finished testing the LED.
Probably the most important knowledge.
.The ratio of visible and UV lights is converted depending on the voltage on the diode.
At 3,2V/LED, LED generates more visible light than at 3,4V.
In other words, the intensity of white is...
see that we have quite contemporary ideas and experiences.
For years I have had a UV light unit consisting of 9 pcs 3W UV LEDs, I have already forgotten what the spectrum is, but it is higher than 365nm. And yes, with these diodes, the visible light is blue-violet and unpleasant.
It's logical...
I ordered a 20W UV LED 365-370nm from China.
The diode arrived today
The LED is 20W, i.e. it contains two rows of 10 diodes each
In the picture, approx. 200mA flows through it at a voltage of 32V 30% from 20W .
Photographed in the dark-
The LED shines quite intensely white, as you can see on the...
That's probably true, but for a rather monstrous 50pF capacitance nad wide temperature range
Typical gate input capacitance of the 74HC is 3pF at 25C, say, 5pF even with PCB that's a tenth the capacity and higher speed at the same current
35 years ago, we designed a measuring device that actually measured the relative permittivity of the measured object. It is not a laboratory meter, but a thing that becomes part of the measured object and is very difficult to repair or change. Therefore, a low price and a long service life (tens...
You are right, on the other hand, the black level can be influenced by the voltage, and a more pronounced black is more visible even with a bad filter.
With LCD, the contrast cannot really be influenced other than by the excitation voltage
Yes, that's how it occurred to me.
What is not clear to me, why it doesn't work?
More precisely, I do not understand why the manufacturer does not specify the characteristics of the converter
The connection resembles a Pierce oscillator, unfortunately it does not oscillate, even if it oscillates...
Today i had time to research it a bit more.
Pins piezo transducer
G - ground base metal plate
M - main
F - feedback
in parallel with the M and F terminals of the piezo is a shmitr triger and resistor 47k.
The only other component is a diode resting on output number 4 of the 8-bit shift...
I have an alarm from DSC, the piezo converter PKM25-6AO takes care of the acoustic signaling in the keyboard.
Unfortunately the keyboard is muted.
After disassembly I found PKM25-6AO. Maybe I'm not picky, but from this datasheet I don't even know what the converter has three outputs for?
I...
ok let's look at the design from the point of view of tolerances and applicability for opto components
The first thing we need to know is in what temperature range our wiring should work. For LEDs, the lowest temperature is critical, because the forward voltage decreases with temperature at a...
If the topic is about how to control an external module with an optocoupler from some MCU, I will contribute a little to the mill.
From the point of view of simplicity, it is really easiest to connect the diodes in series, perhaps it is more convenient to connect U2. Why?
- The current in the...
I quickly sketched the core of the source around the control IC.
sorry for the quality
On the surface of R2, the development was visibly burning, so even though it now has about 10K, it originally had about less than an ohm
The question is what is the control IC with SMD marking JT010?
I have an integrated source for USB 5V 2A in the electric extension cord. He broke down today.
A switching transistor MJE13005 has a short circuit between all electrodes.
Transistor drives SMD IC smaller than SOT23-6 with description JT010.
The IC is connected to the Base and Emitter of the...
Most often, the injection block looks like this
a solenoid opens wax on one side and a vacuum on the other side
schematically, see the second picture
yes, the vacuum also sucks some of the wax from the common part of the nozzle
from this point of view it is better, but mechanically more...
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