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Optocouplers:
Dear all, I am looking at a circuit that contains both a CNY17-3 optocoupler, and a 6N136 opto-coupled logic gate. The specific circuit is from the OpenDCC project (model railways...
Sat. Jan 26, 2013 - 03:51 AM
Low-cost (Asia?) PCB Assembly Houses
Dear all, I am looking to assemble 50 or so simple boards (10 line items, about 30 components, 0603 or larger, all SMT except a connector. No DFN or BGA parts), maybe 100 if that'...
Sun. Dec 30, 2012 - 06:20 AM
SMT Equivalent of 1N4148 Diode?
Dear all, Given the success in the last thread on transistors, I thought I would ask about SMT variants of the venerable 1N4148 diode. I got as far as the MMSD4148, but I suspect...
Sat. Dec 29, 2012 - 11:57 PM
Screw terminal blocks: SMT or through-hole reflow?
Dear all, I am looking to use some screw terminal blocks for a design. The board consists entirely of SMT parts with (maybe) the exception of the screw terminal block for...
Sat. Dec 29, 2012 - 07:38 AM
SMT Equivalent of 2N3904 Transistor?
Dear all, I'm looking for a SMT NPN transistor about the equivalent of the 2N3904, say in a SOT-23 package or similar? Normally I'm a software guy, but I am trying to create a...
Sat. Dec 29, 2012 - 03:09 AM
Capacitor selection for Honeywell HMC5883L
Hello all, I am currently looking at a HMC5883L design and the datasheet has a special note for two capacitors: Quote: The two external capacitors should be ceramic type...
Sun. Jul 29, 2012 - 11:28 PM
Flash tables - order of variables of gcc 4.3.4 vs 4.6.2
Dear all, In my code, I have a table of variables as follows: #include "version.h" #include #define VERSION_TABLE __attribute__ ((section (".version_table...
Thu. Jul 12, 2012 - 12:54 AM
Interfacing a differential Sensor to a Differential ADC
Hello All, Being a hopeless amateur at analogue electronics, I hope someone can give me a few hints on a problem that I have :) I have a differential analogue sensor with the...
Mon. Feb 6, 2012 - 08:01 AM
Using TOSC (RTC) with 32K clock (not XTAL)
Hello all, We are designing a board, and a 32K clock source is already available on the board (it is needed elsewhere). I would like to connect this clock source to the RTC,...
Fri. Oct 7, 2011 - 01:44 AM
1-wire (or I2C) to USB bridge
Hello all, I am trying to find a 1-wire to USB bridge, essentially so that I can talk to a 1-wire bus from USB from a host PC. Does anyone know of a device that does it? There is...
Mon. Sep 12, 2011 - 05:08 AM
Single-supply DAC controlled bidirectional current source?
Hello all, I have an analogue problem which I hope someone can push a hardware-challenged software person (me) in the right direction :) What I need to do is precisely set control...
Wed. May 11, 2011 - 01:02 PM
Salt water (ocean) immersion detection
Dear all, I'm toying with some ideas for a holiday project. What I want to do is to reliably detect when a device is submerged in the ocean, or perhaps more importantly, when the...
Mon. Dec 27, 2010 - 12:43 AM

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