Proteus Library
Can anyone help me in getting Rotary Encoder KY-040 library for Proteus ISIS?
Thank you
Solar powered motor and timer
Hi,
I am new to this site so please bare with me.
I am working on a project where I need a way of powering a 7v 165mA water pump for 5 minutes every 3 days.
I have been using a small solar panel and manually connecting it when I need to run the motor. Now I would like to automate it and introduce a battery and timer circuit in order to completely automate it.
Any advice on what I would need to build this or on where I may be able to get one made would be greatly received.
Thanks in advance
PieEater
Shaded Pole Fan Motor - Speed Control Question
Hi, I'm new here.
We have an oven with a shaded pole AC fan motor - 120VAC, 40W, 3K rpm (the inserted photo is very similar). Since the oven manufacturer cheaped out big time, the plastic fan wobbles badly, generating a very loud vibration noise. I'd like to slow the fan down. I figure that 50-75% speed will eliminate the noise while still providing the cooling the oven requires. I tried a ceiling fan speed control, presumably triac based, but it works too well, slowing down to about 25% speed. While messing with that, I discovered that the fan slows way down when my bench vise jaws clasp the magnetized stator. Further experimentation revealed that any sizable ferrous metal also slows it down. I'm sure I can find just the right size to bring the rpm down to the range I want.
My question is: Will the shaded pole motor be happy with this chunk of metal attached, or will it overheat or otherwise fail?
dissipation in a zener diode
I am experimenting with an unstabilised DC power supply (solar panel array rated at 44V open circuit) which in practise seems to fluctuate up to about 45V open circuit in operation. Could I ensure the output stays at or below 40V by connecting a suitably high power & heatsinked 40V zener diode across it? Like a DO5 stud mount type?
If so.. when the voltage rises above 40V, how would I appraise the actual power dissipation in the zener?
The panels short circuit output is listed at 15A. Would I use straightforward P=IV?
That would seem to say the diode could experience 15 x 45 = 675W above 40V
However the conduction of the diode above 40V, would start to drop the PSU's output voltage so would the actual diode dissipation under full supply output actually be lower?
The highest rating I can find for such zeners seems to be about 50W.
Should I use some form of dummy load in series with the zener, and if so, would that mean I should subtract a figure to reflect the dummy load's own voltage drop, from the value chosen for the zener?
Need serious help
hi guys. I know nothing about electronics, but i want to know if i can connect a signal generator to a high voltage amplifier(20kv). What im trying to archive is getting pulsed HV load. Please help
Radio question. What replaces the LC circuit?
Hey guys,
I have another question about oscillator circuits and RF. My question is;
What replaces the LC circuit or tank in a digital IC radio? For instance, in a traditional tuner you have an inductor+ capacitor resonator circuit that tunes the selected frequency. All ' traditional ' radio receivers/ transmitters I've seen from before modern digital era use these.
This includes AM/ FM tuners, CB radios, alarm clock radios etc. My question is what replaces the resonator in radios that are designed as Integrated Circuits?
How do receivers/ transmitters that are tuned and or modulate digitally work?
How does, say a System on Chip FM tuner for a modern soft logic controlled stereo receiver compare to a ' transistor ' radio?
Is this an example of Phase locked loop??
LED FLASHLIGHT HELP
I have an LED flashlight that runs on 3 AAA batteries.
I want to run it with a 12 volt battery.
I have adjusted a dc to dc converter to 4.2 volts.
The flashlight gets very hot. (It doesn't get hot when the AAAs are connected)
I've checked my volt meter to see if the dc to dc converter was adjusted correctly, and it seems to be.
What am I missing? Why does it get hot on the 12 volt battery power?
Thanks
surplus analog parts
Hey guys and gals. I recently acquired a giant chest of drawers - so to speak - from a thermal camera repair company that went out of business. It was filled with loose parts in tiny bins and I have no use (or knowledge) for them. I was going to toss them, but when I filled a 5 gal bucket and still had drawers to go through I thought I should see if someone could use them. Not sure where to go to try to get rid of them. I don't know enough about the parts to place an add on ebay or local craiglsit. Some of the bins are labeled, some just have parts numbers. There are numbers and such on the actual parts though. I have less than 20 of some things (12 bit dac, 16k x 4 drams, opamps, cvdg, etc.) and more of others (resistors, capacitors, regulators, etc.). If anyone has a need/want for any of these parts or knows anyone who might - or maybe where I might have better luck getting rid of them would be greatly appreciated.
I was told at the time I picked the thing up that some of the parts were obsolete and to just toss them. After speaking with an electrical engineer neighbor, he thought someone may want them as there are those who 'tinker' with analog stuff.
Thanks in advance for any help.
Is it a "transfer switch"?
Hello! I'm building a game that uses small wires to connect & power series' of lights, bells, and whistles (currently using a 9 volt battery). I need to know how to make the buzzer go off when the player diconnects the wrong wire. Kinda like how a transfer switch (in the circuit box of a house) will divert to the generator when the power goes out. In other words, how can I make a light come on by unplugging it?
audio transistor schema...
I am thinking about the signal flow in my circuits...
is it better to use the collectors on the transistors for the input signal ----
and
the emitters on the transistors for output signal?
or is it arbitrary and the flow of the shema has little to do with proper flow of the signal?