Latest threads in Electronics Designshow only best voted threads
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Inverting Sallen-Key low pass filter
Can someone please describe the circuit topology for an inverting two pole Sallen-Key (or similar) low pass filter, or point me to a reliable diagram? There are plenty of circuits online for the...
43
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8 years ago
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43 | |
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OT: MPlab error message (sometimes)
On rare and ranDUMB occasions, i get to see: "PICErr0037:Timed out waiting for response from PICkit3." "Programming failed." At that point, the system is useless. If i unplug the PCkit3 and remove...
6
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8 years ago
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6 | |
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Velleman Soldering Iron VTSS5
Found one of these today new for $10 at a swap meet. Looked like a good iron with adjustabe temperature and a small tip for small stuff. Unfortunately, I didn't realize the housing that holds the iron...
6
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8 years ago
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6 | |
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filling vias
Has anyone filled vias with solder to improve thermal and electrical conduction? I figure that if a via has an unmasked pad, and it's solder pasted and reflowed, the solder will melt and flow into the...
69
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8 years ago
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69 | |
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OT: PIC16F648A "mismatch"
Been doing a lot of experimental programming on a PIC16F648A. This morning when i fired up the MPlab PICkit3, and target board,i got a message like "Device mismatch target id 0000 0000 does not match...
13
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8 years ago
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13 | |
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Package Mechanical Drawings
I have read part mechanical drawings for some time now, but it seems there is a lot more information than I am able to get out of them. For example, has a drawing for the VF256 on page 91. The usual...
8
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8 years ago
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8 | |
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PING: Martin Riddle
Hi Martin, Sending E-mails to the various engineers I worked with at TLSI, I've received zero response. Is TLSI out of the chip business? When I was there on Long Island (when we met) TLSI seemed to...
2
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8 years ago
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2 | |
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A very silly circuit
12v automotive SSR, to replace a failed $35 unit in my car. Q3 | |-------+---O | |
97
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8 years ago
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97 | |
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Small voltage detector
Hello, I know that there are hordes of nice comparators in SOT-23, but just out of curiosity: is it possible to build a small voltage (relatively to GND) detector using just one transistor and no...
25
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8 years ago
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25 | |
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Diptrace solder mask
Hoping for a guru, is there any way to turn of the solder mask on just a small section of a PCB design. I've had no luck at all.
1
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8 years ago
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1 | |
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Death by 9V battery design challenge
Hi all, Just wondered if it is possible to come up with a circuit which would enable a single PP3 9V battery such as this: to function as the power source for a taser? I'm sure proprietary tasers are...
70
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8 years ago
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70 | |
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Microcontroller NG
I am somewhat disappointed at the lack of newsgroups dedicated to microcontrollers. Specifically the more popular ones such as Arduino, Raspberry Pi, Propeller, Basic Stamp, etc. The existing groups...
10
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8 years ago
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10 | |
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Alternative for Unix's 'dc' desktop calculator
Whenever I found myself out of reach of my HP32-C, I used to use the UNIX RPN desktop calculator 'dc'. However, for engineering, 'dc' gets very awkward with very large or very small numbers. So I made...
7
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8 years ago
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EMC Screening Query
I'm working with some equipment which contains a commercial SMPS which has been enclosed in a stainless steel box to screen it. However, we still get some noise from it, experiments suggest that this...
9
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8 years ago
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9 | |
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OT: Fetch random byte on PIC16F648A and "return"
OK, have code that can jump to any location AKA any part of any table of any length. So..PCLATH is set, PCL is set and BAM we see a RETLW . Obviously that is not a CALL so AFAIK nothing is pushed to...
9
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8 years ago
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9 |