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, 2014-03-20 23:15

Fantastic schematics and explanations, but I would like to find out if:

1. This circuit would still function at 3.0 to 4.2V supply voltage (used to drive the ENABLE line of an LVDO)

2. A 1s delay Power-ON delay could be introduced instead of a short press

3. Does this switch configuration effectively debounce it?

Thank you so much, Alex

, 2014-03-21 05:38

Apologize for not referencing the circuit in question - the Raspberry PI ON/OFF controller:

Thanks again!

, 2014-02-28 23:32

What kind of caps are those in figure 6? Are they ceramic? I noticed they are not polarized.

, 2014-03-13 20:40

Yes, in general non-polarized capacitors on our boards are ceramic chip capacitors, most commonly 0603 package X7R type with 20% tolerance, but sometimes larger packages for higher capacitance or higher voltage limits, or tighter tolerance for timing circuits.

, 2014-02-08 00:00


Thank you for the instructive circuits and tutorials. I intend to build an on/off circuit for an RPi - 2 questions

1. The diode is labeled as a BAV99, which is a switching diode array, not a single diode as pictured in your circuit. Is this really the correct part number? 2. The Auto ON/Auto OFF jumper is not quite clear as it is explained, although I think I am reading the diagram correctly. If the switch is set to ground, then the circuit will always default to ON, until it is turned off with the momentary button. Is that correct?

Thank you for your help.

-K. Nelson

, 2014-03-13 20:59

1. Yes, in this case we're just using one of the two diodes in the BAV99 part. It's inexpensive enough that from an inventory management perspective, it's simpler to use this part both where two diodes in series are needed and where a single diode is needed, rather than stocking a separate part for single diode applications. From a technical perspective, any silicon diode will work in this application.

2. Yes, you are correct. The Auto ON/Auto OFF jumper only affects what happens when external power is initially applied; shortly after power is applied the 0.1uF capacitor charges and then the circuit is controlled by the On/Off switch.

, 2014-02-06 21:27

Dear Sir;

I have a program about writing & reading from RS232 however it drops bytes and I really cannot read what i write what can be the issue? Can it be related to my low ram which is only 1024 best

, 2014-03-13 21:01

For this issue I suggest looking to online forums for general programming questions, such as:

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