Latest threads in Hobby Electronics Basicsshow only best voted threads
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Minimum Market Price for A Prototype Circuit
The amplitudes of two ~ 1 volt, 1 Hz AC signals need to be divided. Any DC offset or low frequency noise can be subtracted after half wave rectification / comparator or integration. It can be all...
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14 years ago
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Interference
I recall reading that if an AM radio is tuned to frequency x plus or minus the heterodyne frequency a radio tuned to frequency x will be blotted out. Is this true? If so what is the heterodyne...
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14 years ago
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Correlated Double Sampling
Hi, I'm looking for a circuit (schematic) with discrete components that allows me to do Correlated Double Sampling at low frequency (100kHz) in the field of image sensors. Circuits with chips are also...
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14 years ago
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Transformer power usage
I am curious. Does a transformer draw (considerable) power even with no load. I have a cheapo, unregulated 88W 120VAC to 12VAC transformer/timer (landscape lighting) in which the timer had failed. I...
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14 years ago
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Need some advice about a Led switch
I want to use a switch to step through a ten LED string one LED at a time. I also need to bypass a LED (take it out of the sequence) when I want. I'm ginna be using a foot swtich if this matters. Any...
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14 years ago
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Wiring Batteries Together
If I wire three 12 volt batteries together in series to get a 36 volt pack and they are all rated at 10 Ah each, then what is the Ah rating of the pack? I think it's 10, but I'd like some...
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14 years ago
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How does this oscillator work?
I have come across a design for an oscillator that, boiled down to its essentials, has a configuration like this: ,--- VCC | .-. | | 330 | | '-' | | .----UUU----o | | | | --- | --- | | o--- Output | |...
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14 years ago
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timing circuits hel please
I need a control circuit to control 3 relays this is what I won't to happen a push to make switch is closed relay 1 closes time delay 0 - 5 seconds relay 2 and 3 close the push to make switch is...
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14 years ago
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B&K Precision Model 4011 Function Generator Price?
I have the Subject device, and am thinking about selling it. I bought it 9 years ago, and doubt that I even plugged it in. I have no idea what I paid for it. I see a 4011A is selling for $335. Any...
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14 years ago
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Bio Sensors
Is there any equipment to moniter blood pressure or a human parameter in bio sensors
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14 years ago
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Rectification Quotient Sync Filter
Rectify both the signal and the ref along with their noise components _then_ divide. Since there are no humps from multiplying two in sync signals as with lock in, only the noise needs to be smoothed....
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14 years ago
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Cheap trimmer adjustment tool
aka trimmer alignment tool. Looking for the flat head type used for adjusting pots. Cheapest I've seen is $.70, anyone seen a cheaper source in the US?
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14 years ago
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Electro-Magnetic Pulse
This guy was on C-span Books today. Fascinating concept, It is Semi Fiction. EMP is real, the story is fiction, set 1 second after a nuclear device sends out an electro-magnetic pulse....and the world...
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14 years ago
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Quotient Sync Filter Better Than Lock In
A lock in amplifier multiplies an AC signal + noise by a synchronous reference signal. If the signal is sinwt and the ref is sinwt, the output is sin^2(wt) which is always positive. Regardless of the...
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14 years ago
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IC Data Catalogs
Hello! Sorry if this has already been asked ad naseum, but here goes. When i was a little, my father used to have these large databooks from the major ic manufacturs, that listed the specs on...
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14 years ago
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