Latest threads in Hobby Electronics Basicsshow only best voted threads
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Battery backup
Hi All I have a setup with 8051 micro controller and I want to provide a battery backup so that when power fails the micro continues to work. Only the micro needs to work and other peripherals need...
10
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15 years ago
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10 | |
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Maximum load current for 74HC device?
How much total current can be drawn from a typical 74HC device? I see specs that state the ground current cannot exceed 50mA and other specs that say the device dissipation is limited to 750mW. Most...
5
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15 years ago
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5 | |
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volume control for clock
Hello, I have an electronic quartz clock with chimes that needs a volume control. It has a 2 1/4 speaker and is way too loud for the room it is in. Is there any place that makes a inline volume...
6
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15 years ago
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6 | |
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CFL interfering with TV remote?!
Will a CFL interfere with a TV remote (I guess I mean "normally")? The new flat screen I purchased for my bedroom seems to either stop working or will marginally work till I turn off the overhead...
5
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15 years ago
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5 | |
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D82C55AC-2
I've bought 10 pcs of "82C55" through mail, and received D82C55AC-2. The problem is that the output high voltage of any pin is not 5V, but 3.8V. Nothing is connected to the port pins, VCC is 4.85V. Am...
2
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15 years ago
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2 | |
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Messages Deleted on Answering Machine
My housekeeper accidentally deleted all the messages (including my 2 year old daughter's) from my Uniden 900 MHz 378 series telephone answering machine. Any possibible way of getting those messages...
1
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15 years ago
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1 | |
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How many volts are generated by the difference of 1 electron?
Hi: How many volts are generated by the difference of 1 electron? I would imagine this value to be astronomically small. Thanks, Radium
21
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15 years ago
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21 | |
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Is a parallel amp the same as a balanced amp?
Hello all, The differences between a parallel amplifier and a balanced amplifier is rather confusing. Are they the same, or are they different? Both these circuits, and their advantages, appear to be...
14
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15 years ago
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14 | |
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Question about equivalent model
I have some doubts about equivalent model for pn junction...if i consider a pn junction, the large signal equivalent model is composed by a dc voltage (representing the cut-in voltage) and a resistor....
2
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15 years ago
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2 | |
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Low pass filter hookup
Hello, I created a low pass filter in orcad and trying to put theory into pratical. The circuit output is always showing the input at about one third the pk-pk voltage even at 30kHz and more, this is...
4
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15 years ago
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4 | |
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What is the benefit with comparators that have a Hysteresis pin?
What is the benefit with comparators that have a Hysteresis pin? I'm using one the LTC1440 and I don't see any benefit you still require two resistors for Hysteresis. Is the Hysteresis pin tied...
3
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15 years ago
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3 | |
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Please help!!
Could someone please help me. I need Hayt: Engineering electromagnetics, 1981. 4th edition solution manual. It will help me a lot if someone of you good people send it to me on my mail or post a...
4
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15 years ago
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4 | |
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details about emitter follower voltmeter
i have a presentation on emitter follower voltmeter and i dont know nothing abut it.if anyone give me details on emiter follower voltmeter mail me on
4
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16 years ago
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4 | |
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How to use variable power supply for charging
Hi, I'm reposting this here, my previous attempt was probably in an inappropriate place. I bought a variable voltage variable amp power supply to use charging my RC batteries: I don't really...
5
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16 years ago
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5 | |
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3 in 1 toggle switch?
Looking to do the following: I have a SATA drive I want to be able to disable the power to on occasion. Long and short, 3 wires and 3 voltages that I want to be able to cut off via a switch (don't...
13
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16 years ago
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