1/8(0,125)Watt resistors in 9v pedals?
- alexradium
- Resistor Ronker
sure,Marshall did it,worked fine.
- ppluis0
- Diode Debunker
Hi folks,
If we connect a 680 ohms resistor across the contacts of a fresh 9 Volt battery, the dissipation in that resistor is only 119 mW
So, resistors of higher value than 680 ohms dissipate consequently less power than 1/8 W in stompboxes working at 9 Vdc...
Cheers,
Jose
If we connect a 680 ohms resistor across the contacts of a fresh 9 Volt battery, the dissipation in that resistor is only 119 mW
So, resistors of higher value than 680 ohms dissipate consequently less power than 1/8 W in stompboxes working at 9 Vdc...
Cheers,
Jose
- POTL
- Resistor Ronker
This is considered subject to the connection to the network 9 volts.ppluis0 wrote:Hi folks,
If we connect a 680 ohms resistor across the contacts of a fresh 9 Volt battery, the dissipation in that resistor is only 119 mW
So, resistors of higher value than 680 ohms dissipate consequently less power than 1/8 W in stompboxes working at 9 Vdc...
Cheers,
Jose
It turns out that values less than 680m can be used when connecting to the ground or the sound part, the main thing is not to connect directly to the power (half-power again, it does not concern.
I'm right?
- deltafred
- Opamp Operator
From a power rating point yes you are right.POTL wrote:I'm right?
I would think (without breaking out Kirchoff's Law on all resistors in a pedal) that you can use 1/8W resistors in 99.99% of cases.
There are probably exceptions in some power supply polarity protection circuits. If the safety of your pedal relies upon a low value resistor (+ diode) shunting an incorrect polarity power supply down to a level that does not damage the semiconductor devices then it will be best to calculate the maximum dissipation and add a safety factor.
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Jeez, she's an ugly bastard, she makes my socks hurt. I hope it's no ones missus here. - Ice-9 2012