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Ref: Post #88 and my post #80. The collector of the transistor would connect to pin 4 of the 555. When ON the transistor would prevent the 555 from oscillating.
I would suggest that what ever oscillator circuit you use to generate a tone that the output duty cycle is as close to 50/50 as...
See: Dreamincode dot net: Programming and Web Development Help | DreamInCode.net for tutorials and C and C++ Forum | Dream.In.Code for help with C++; choose the forum wisely as some are for advanced developers who may not want to help with homework if the post does not show effort. Regards: jvj
PIC10, 12, 16, 18, 30F, etc. all would work in the OP's app in some fashion. As would many AVR devices. The BASIC Stamp would work as well. I have worked, at one time or another, with all of the above. I mentioned the Arduino because the OP said it was once a consideration. If one excludes PWM...
Hi there. The attached BMP belows shows a portion of an LTspice schematic I used to calculate the value of series cap used to pull the edges out of a pulse train, rectify these edges and use the resulting voltage to switch on a transistor. The transistor was used as a hold off switch to prevent...
Homework? Here are a couple of pointers:
1) look up polar notation for the RL circuit at all three frequencies.
2) sum the imaginary and real components at all three frequencies.
3) Z will increase linearly with frequency as the Z of the L is 2 x PI x F x L
(hint: you are dealing with 2nd and...
With this post I am venturing into the realm of ljcox who seems to have the oscillators worked out and a volume decay in the works. And I admit that the following text is a bit behind some of the OP's new requirements, i.e. the volume decay.
The two step tone presents a consideration not...
I will present my 'ideas' and will leave hands-on to the OP and to other interested readers.
My next contribution follows.
Lets consider the trigger condition first described as an output from a voltage comparator. At one output level (say low) there is no one in the door and at another level...
Agreed. The PLD/FPGA approach may be a bit of an overkill and other than providing an educational aspect does not offer an advantage over a PIC or AVR. (I have worked with both as well as with FPGAs.)
Having said that, the rest of my post was about breaking the application into a series of...
I have been away from the board for a long time and a tickler/reminder email brought me in today. And to this thread. I have sampled the thread which started from the OP asking about a 555/556 solution and is now dithering between solutions involving CMOS logic and a uC.
The OP seems happy...
how to run the inverter motor
Another consideration about the choice of the inverter is whether its output is suitable for AC induction motors over and above the inrush currents. For an AC motor the output should be as close as possible to a sine wave. On many inverters the output is a chopped...
People who know the old tube stuff are correct in confirming the part is a dual capacitor and its use, i.e. grid bias and plate voltage. I will add that these capacitors do not last forever and could be aged to the point where they will fail, perhaps catastrophically. My advice is to replace...
This is my first post/reply and I am happy to help but yninish asked for some details that are not on the ckt diag. Specifically he asked for the value of the resistor used to limit the current through the LED. I am not sure about the '877 but some pics can sink/source 25 mA. If this is the case...
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