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A couple of weeks ago, I asked a question that involved Holtek's HT12E/HT12D encoder-decoder pair, although the issue was not mainly about them. Now I have a question that's more directly about these ICs.
My order of a batch of these ICs arrrived today and I immediately tried them out on a...
I feel really stupid. I completely forgot about the latching nature of the output. My excuse is that I'd been playing recently with a similar encoder-decoder pair - the PT2262/PT2272. The decoder comes in latching and momentary versions and I used the latter type. Thanks for pointing that out...
No. At least two transmitters have to be transmitting at the same time. Each transmitter sends one of two possible signals besides the ID address code.
I thought of using a single common transmitter, with the four inputs switched in sequence. The problem is that the encoder-decoder bandwidth is...
I know how to send and receive simple slow code (like on/off signals) using an encoder-decoder combination such as the popular Holtek HT12E/HT12D pair and OOK RF modules like inexpensive 434 MHz Tx-Rx pairs.
I would like to operate four such pairs in close proximity at the same time. Each pair...
BTW, I'm not asking anyone to guarantee that a particular product - Chinese or otherwise - will or will not work. What I'm asking is about the principle of feeding an ARC signal to a 'normal' HDMI input.
I hope this is the right section for my question: Will an HDMI-ARC output work with an HDMI audio extractor?
I bought a 55-inch TV but the built-in sound is quite poor. For watching cable TV, I connect the analog audio output of the set-top box to a decent 2.1 powered speaker I already have...
I vaguely recall there being a way to keep a computer monitor from going into standby in the absence of a signal, e.g. for testing purposes. Something like placing a resistor from one of the sync pins to ground or tying +5V to a pin or something else. Can anyone please provide some information?
Does it mean that the input then goes directly through the diode unregulated, and that Vout will simply be Vin minus the diode drop (ignoring the DCR of L)?
With step-down voltage regulators -linear or switching - I think I have a good idea of what happens when the input voltage drops below the minimum required for proper regulation.
What happens if the input of a boost converter equals or exceeds the set output voltage? Does it simply continue to...
Any recommended reading or link(s)? There are many aspects to USB, some of which are not related to power. And though most phone chargers use USB ports nowadays, not all of them do. For example, I still have Nokia 1100 and C2 phones that I still use occasionally. Both use DC barrel jacks...
How critical is the output voltage of a mobile phone charger in determining the charging current?
For example, if we were to use a well-regulated power supply as a charger with a low output impedance and no current limiting, will it make a significant difference if the voltage is set at, say...
That was my point. Supply from a well-regulated voltage through 22k to 350 Ω dynamic impedance is essentially constant current.
As I said in my second post, the target temperature regulation is not very tight - ±1ºC or at most ±0.5ºC. The error introduced by the not-quite-constant nature of the...
Let's do some sample calculations (with some simplifications) and see what we come up with.
Say we start out at the center temp of 5ºC. The diode is biased through 22k from 2.5V (TL431). Assume a diode Vf of 550mV at that temp and current. Ibias = (2.5-0.55)V/22k = 88.6µA. (550mV is...
I should have made one thing clear: The circuit is for controlling, not for measuring, temperature. The control range doesn't have to have a linear scale, so variations in forward voltage drop with temperature doesn't have to be perfectly linear.
I'll be using a TL431 as both the reference...
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