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 Forum index » DIY Hardware and Software » YuSynth
1/4 or 1/2 watt resistors
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intoodeep



Joined: Mar 14, 2010
Posts: 7
Location: los angeles

PostPosted: Mon Mar 15, 2010 11:24 am    Post subject: 1/4 or 1/2 watt resistors
Subject description: cannot figure this out
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i am building some yusynth modules and am not sure whether to buy 1/4 or 1/2 watt resistors. it doesn't seem to be discussed here or on the yusynth site, so i was wondering what others have used. thanks for your help!
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yusynth



Joined: Nov 24, 2005
Posts: 1234
Location: France

PostPosted: Mon Mar 15, 2010 1:32 pm    Post subject: Reply with quote  Mark this post and the followings unread

1/4W unless specified otherwise
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Don Erskine



Joined: Jun 17, 2010
Posts: 39
Location: UK

PostPosted: Sat Oct 16, 2010 2:49 pm    Post subject: Reply with quote  Mark this post and the followings unread

Remember that some simple math can give you the power dissipated in a resistor.

V=IR (Volts = Amps x Resistance)

Power in watts:

W= VA (Volts x Amps)

Incidentally, with most synths running from voltages of +/-15v or less, the highest voltage that could be across a resistor is 30v, and so in practice no resistor with a value of more than 3.6Kohms would need to be rated at more than 1/4 W in any design. A handy rule of thumb.
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FJS



Joined: Jan 12, 2014
Posts: 5
Location: Bavaria

PostPosted: Sun Jan 12, 2014 9:25 am    Post subject:   Reply with quote  Mark this post and the followings unread

Hello Don,

Hope the question is not too stupid. I can follow your simple math. But I still have a couple of 0,6W resistors in a box. I can't see a draw back from using them? Do I miss an important aspect?

Thank you.
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yusynth



Joined: Nov 24, 2005
Posts: 1234
Location: France

PostPosted: Sun Jan 12, 2014 10:07 am    Post subject: Reply with quote  Mark this post and the followings unread

The "wattage" of a component gives the maximum power that it can dissipate without being destroyed. This is an upper bound only. Therefore if you have 0.6W resistors there is no problem using them at any power below 0.6W.
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