freestompboxes.org

Can I use such resistors in pedals?
Or at least it is 1/4 Watt

sure,Marshall did it,worked fine.

alexradium wrote:sure,Marshall did it,worked fine.

Great
Does this apply to the new Marshall?

Also I noticed compact resistors in EQD pedals, as I understand it is also 1/8 watt, am I right?

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

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

This is considered subject to the connection to the network 9 volts.
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?

POTL wrote:I'm right?

From a power rating point yes you are 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.