I thought all the BOMs on my website used 1% 1/2W Metal Film from the MSR25
Series by Phoenix. If you can point to where I refer to 1/4W that would be
appreciated.
Most synth circuits will work with 1/4W resistors without any problems.
There are a few exceptions most often where they are used in power supplies
but good schematics/BOMs will usually emphasise those as been different. You
will also probably find in most instances that you can even use 1/8W.
Usually, as you increase the wattage you also increase the size so
substituting larger wattages may result in assembly problems however there
would be no side-effect on the circuit.
I also almost exclusively use 1% resistors even though in many cases 5% will
work fine. Many of Ray Wilson's circuits use and list 5% for the major part
with him specifying 1% in the more critical areas. By staying with 1% I have
a smaller variety of stock to carry and can also buy larger volumes so the
small cost difference between 5% and 1%, I feel, is of little consequence.
I also prefer to stay with Metal Film for the same reason even though Carbon
Film will work fine in many instances.
Using larger wattage resistors has NO bearing on the power drawn by your
circuit. It dictates how much the component can safely carry without damage
so in this case a 0.6W resistor can dissipate 600mW of power and will
achieve a specified temperature in doing so (see the components datasheet)
whilst a 1/W resistor can only dissipate 250mW before reaching a similar
temperature.
In the end it will come down to budget and 5% Carbon Film can generally be
used. However you will need to check the circuit and look for areas where
the design specifically requires the tighter tolerance. Irrespective of that
I would tend to argue that the few cents you might save using, say, 5%
resistors instead of 1% would be insignificant compared with the cost of
other parts. A prime example would be pots, knobs and jacks where you are
paying anything from 50 cents to a few dollars and THAT is where you should
be aiming to save money.
Best Regards
(Mr) Laurie Biddulph
Mobile: 0400 257 645
Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com
This e-mail and any files transmitted with it are confidential and intended
for the addressee only.
If you are not the addressee you may not copy, forward, disclose or
otherwise use it, or any part of it, in any form whatsoever. If you have
received this e-mail in error please notify the sender and ensure that all
copies of this e-mail and any files transmitted with it are deleted.
Any views or opinions represented in this e-mail are solely those of the
author and do not necessarily represent those of Elby Designs.
Although this e-mail and its attachments have been scanned for the presence
of computer viruses, Elby Designs will not be liable for any losses as a
result of any viruses being passed on.
Series by Phoenix. If you can point to where I refer to 1/4W that would be
appreciated.
Most synth circuits will work with 1/4W resistors without any problems.
There are a few exceptions most often where they are used in power supplies
but good schematics/BOMs will usually emphasise those as been different. You
will also probably find in most instances that you can even use 1/8W.
Usually, as you increase the wattage you also increase the size so
substituting larger wattages may result in assembly problems however there
would be no side-effect on the circuit.
I also almost exclusively use 1% resistors even though in many cases 5% will
work fine. Many of Ray Wilson's circuits use and list 5% for the major part
with him specifying 1% in the more critical areas. By staying with 1% I have
a smaller variety of stock to carry and can also buy larger volumes so the
small cost difference between 5% and 1%, I feel, is of little consequence.
I also prefer to stay with Metal Film for the same reason even though Carbon
Film will work fine in many instances.
Using larger wattage resistors has NO bearing on the power drawn by your
circuit. It dictates how much the component can safely carry without damage
so in this case a 0.6W resistor can dissipate 600mW of power and will
achieve a specified temperature in doing so (see the components datasheet)
whilst a 1/W resistor can only dissipate 250mW before reaching a similar
temperature.
In the end it will come down to budget and 5% Carbon Film can generally be
used. However you will need to check the circuit and look for areas where
the design specifically requires the tighter tolerance. Irrespective of that
I would tend to argue that the few cents you might save using, say, 5%
resistors instead of 1% would be insignificant compared with the cost of
other parts. A prime example would be pots, knobs and jacks where you are
paying anything from 50 cents to a few dollars and THAT is where you should
be aiming to save money.
Best Regards
(Mr) Laurie Biddulph
Mobile: 0400 257 645
Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com
This e-mail and any files transmitted with it are confidential and intended
for the addressee only.
If you are not the addressee you may not copy, forward, disclose or
otherwise use it, or any part of it, in any form whatsoever. If you have
received this e-mail in error please notify the sender and ensure that all
copies of this e-mail and any files transmitted with it are deleted.
Any views or opinions represented in this e-mail are solely those of the
author and do not necessarily represent those of Elby Designs.
Although this e-mail and its attachments have been scanned for the presence
of computer viruses, Elby Designs will not be liable for any losses as a
result of any viruses being passed on.
----- Original Message -----
From: "Rune Sagevik" <rsagevik@...>
To: <cgs_synth@yahoogroups.com>
Sent: Wednesday, September 27, 2006 5:51 AM
Subject: [cgs_synth] DIY newbie question.
> I`ve just recieved a couple of Psycho LFO pcb`s and a couple of
> questions quickly came up..
>
> This is more of a DIY/electronics general q. and not specific to the
> LFO`s I guess..
>
> I`ve visited Elby Designs page, and in the CGS parts lists you can
> find there it is referred to using 1/4 watt 1% metalfilm resistors.
> What I was wondering (as I`ve not to much electronics skills yet) is:
> To what extent is it possible to use types of resistors with other
> watt specifications?
>
> I`m asking because I got hold of a bunch of 1% metalfilm resistors at
> 0,6 watts.. Could I use these with great result? Why or why not? My
> initial thought was yes, and that the only result of this would be
> higher power consumption of the module itself but I dont know.. right
> or wrong?
>
> thanks
> and
> regards
> Rune
>
>
>
>
>
> The CGS Modular Synth home page: http://www.cgs.synth.net/
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
>