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11 votes
Accepted

Do capacitor packages make a difference in MLCCs?

It is likely that the capacitors are Class2 ceramic capacitors. The capacitance is voltage dependent. The voltage rating has little effect. Here is a graph showing this effect from Analog Devices. For ...
RussellH's user avatar
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9 votes

Do capacitor packages make a difference in MLCCs?

Ceramic capacitors in that value and size are (at best) something like X7 or X5 dielectric, and hence have a large voltage coefficient (as well as temperature coefficient and aging). The capacitance ...
Spehro Pefhany's user avatar
3 votes

Wiring basics for timer relay

Yes, it's fine the way you described. The contacts and input are all rated for mains voltage so as long as the strobe and horn are 120VAC too it will be fine. If you want the strobe to start when the ...
Spehro Pefhany's user avatar
3 votes
Accepted

Wiring basics for timer relay

Your thinking is correct. Just power the strobe from the sensor. (I wasn't sure if that's what you were intending.) simulate this circuit – Schematic created using CircuitLab
Transistor's user avatar
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1 vote
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ATMEGA2560-16AU PWM control using AVR-C

For PWM control of pins PH3(OC4A) / PH4 (OC4B) / PH5 (OC4C) / PH6 (OC2B) /PB6 (OC1B) / PB7 (OC0A), what timers do I need to use? Timers 0, 1, 2 and 4, with their associated pins? As the digit in the ...
G36's user avatar
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1 vote

Do capacitor packages make a difference in MLCCs?

Ceramic capacitors with dielectrics other than C0G/NP0 are varicaps. Their internal structure as well as dielectric will affect how sensitive their capacitance is to DC voltage bias. Why is that ...
Kuba hasn't forgotten Monica's user avatar
1 vote

Why is the Relay "Chattering"?

When your load is applied the measured voltage will drop a bit (or maybe a lot) so you can get chattering as a result of that. So it's important you have adequate hysteresis for the lower trip point. ...
Spehro Pefhany's user avatar
1 vote

Circuit design for a timer and relay

I recommend that you replace the LM2904 op-amps with comparators. (They'll work better, don't risk latch-up in saturation.) Many comparators have open-collector or open-drain outputs and this would ...
Transistor's user avatar
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