Occasionally, we are asked about circuit design or construction, and are not able to provide an adequate explanation with an FAQ. For these cases, we have developed Application Notes that we hope you will find helpful:

AN01 - Transistor Testing It's very difficult to know which lead is which for many transistors. Sure, there are special testers, but what if you don't have one? This Application Note shows one method of identifying the three leads of an NPN or PNP transistor, and it doesn't require much more than a voltmeter.

app note 01   (44K)

AN02 - ELM327 Circuit Construction This Note provides some helpful advice for those that are building the ELM327 Example Application circuit shown in Figure 9 of the data sheet. It provides a few suggestions, and also shows typical voltages that should be found, both before the main ICs are installed, and afterward.

app note 02   (46K)

AN03 - ELM327 Low Voltage Resets If your ELM327 circuit is experiencing occasional 'LV RESET's, then you should read this Note. It talks of the main cause of the resets, and provides two methods to prevent them.

app note 03   (15K)

AN04 - ELM327 and Bluetooth We have had a large number of questions asking about the use of Bluetooth modules with our ELM327. This Application Note discusses two ways in which you might connect them.

app note 04   (33K)

AN05 - Bench Testing OBD Interfaces This note provides some tips on testing your OBD Interfaces before connecting them to a vehicle. It's a collection of some of the more common issues that we've been asked about over the years, with an emphasis on testing the CAN protocols. If you are building your own circuits, you will likley find this note to be helpful.

app note 05   (21K)

... and more will be coming.

If you have comments on any of the above Notes, or have an idea for a new Application Note, we would appreciate hearing from you. Email them to: feedback@elmelectronics.com





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