Latest threads in Hobby Electronics Basicsshow only best voted threads
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Cap-Offset Block Filter Returns A Fractional Derivative Of Order 0 < nu < 1
See the part on the fractional derivative of a constant. This confirms that the cap filter is outputing something proportional to a fractional derivative with an order between 0 and 1. A big cap is...
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13 years ago
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Triac leakage
Hi Just curious! I wish to change the phases using triacs - Three triacs are connected to the three pahses (220V). The other terminals are bound to the output. By firing selectively a triac the output...
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13 years ago
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Formal Proof of Cap / DC Offset Filter = 2 Step Process
If _any_ fractional derivative obliterates a "DC offset" [constant], then a large cap is a 2 step process, first taking a derivative then an integral. Bret Cahill
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13 years ago
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reusing cell phone batteries
OK I have a ton of serviceable cell phone batteries that still hold a charge. What I want to do is use a higher capacity battery for a small camera. The camera comes with a 200 mah li po and I have...
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13 years ago
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pspice: skipbp
Hi, I want to ask. What is exactly "Skip initial transient bias point calculation"? When I tried to simulate my circuit, there is an error of convergence. But when I click the skip button, there is no...
1
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13 years ago
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Formula for charging time of 12v battery
I have a Powerpack 300, which is a 12v battery at 12Ah. Using the AC adapter with the house outlet (20amp at 120v) it takes 17 hours to fully charge the battery. How would I calculate the...
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13 years ago
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28 | |
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dvd persists
This is getting absurd. A stupid dvd player is locked to the mnc a
2
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13 years ago
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2 | |
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FidoCadJ: a drawing utility for discussion groups and forums dedicated to electronics
Hello to everybody, discussing about electronic circuits often requires to exchange schematics. This is somehow awkward to do on a Usenet group like or on an Internet forum, since it is not possible...
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13 years ago
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TO1 Footprint
Hello, I need to make a footprint for a TO1 package but I can't find the pin spacing dimensions anywhere. All I can find on the web is the diameter of the can is (0.240") and height of the can is...
2
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13 years ago
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2 | |
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Cap-Offset Block Filter Is Actually Taking a Derivative & Then Integrating
It's easy to eliminate an offset from a fluctuating signal with an inline capacitor. If the cap is small enough and/or if you wait long enough the output signal will start to approach something...
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13 years ago
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AC fractional synchronous motor
I have a well-made vintage motor (used in a vintage professional chart recorder)and the motor is marked "Synchronous". (Evershed & Vignoles type FCX31/AS15 and it's about 2 long and 2" diameter). Four...
14
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13 years ago
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dvd circuitry
I have a expensive (dvp series) Philips dvd player that is locked to a specific region. It is locked so well that none of the hack methods available in the internet will affect the remote, let alone...
8
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13 years ago
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Einstein's Car Battery
After the recent threads about charging lead-acid batteries, this might be of interest: Seems that the reason lead-based batteries put out 2+ volts per cell is that their outer electrons are whipping...
1
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13 years ago
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Please help me identify these PCB connectors
I need to replace a cable on a piece of equipment. The ends of the cable connect to PCBs using the type of connector I'm used to seeing all the time when I dismantle stuff. However, now I actually...
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13 years ago
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Power supply for LED array
Hi, I hope I'm in the right group to ask these two questions, so here goes... I'm building a lighting feature with 60 LEDs[0], planning to power it with a standard switched mode DC adapter [1], and...
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13 years ago
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