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Old 8th October 2013, 10:19 AM   #13361
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How critical is the 47K5 resistor at the input ?

I'd have thought that a standard 47K could be used here.

I've ordered all the correct components but for some reason the 47K5 are out of stock.
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Old 8th October 2013, 10:50 AM   #13362
Cobra2 is offline Cobra2  Norway
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47k-47,5-50k is an industrial average

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Last edited by Cobra2; 8th October 2013 at 10:53 AM. Reason: oppps!
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Old 8th October 2013, 10:56 AM   #13363
AndrewT is offline AndrewT  Scotland
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Anywhere from 22k to 220k would do.
47k is perfect.

I do not understand why some builders/designers use E96 values for components where tolerance is not a serious issue.

Matching of resistors is often a benefit.
But that does not mean 47.5ohms +-0.1%. It means match to +-an appropriate tolerance, but the components could be anywhere in the +-1% range and in many cases +-5% would not make a significant difference.
eg the emitter resistors in a BJT LTP could be specified as 100r
99r and 101r will make a small difference in performance.
But using 99r and 99r2 will be virtually the same as using 100.8r and 101r
The matching is what is more important. The absolute value is relatively unimportant. The LTP would probably work very well with 98r & 98.2r and probably OK with 105r and 105.2r
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Old 8th October 2013, 11:10 AM   #13364
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It is odd because in the F5 only the input resistors are E96 values, the rest are E24 ?
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Old 8th October 2013, 11:14 AM   #13365
AndrewT is offline AndrewT  Scotland
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I have occasionally referred to you as Katie's Dad.
You have not confirmed if you are Katie or Dad.
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Old 8th October 2013, 11:24 AM   #13366
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It depends on what time of day. It's Katie at the moment. Dad comes home depending on what shift he is on and uses my account.
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Old 8th October 2013, 11:59 AM   #13367
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Quote:
Originally Posted by AndrewT View Post
I do not understand why some builders/designers use E96 values for components where tolerance is not a serious issue.
Could be that it's a result of Mouser having RN60 47k5 in stock instead of RN60 47k.
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Old 8th October 2013, 12:22 PM   #13368
6L6 is offline 6L6  United States
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Quote:
Originally Posted by nebiki View Post
I'm afraid I have another question, a very stupid one: do I need those PCBs?
The only stupid questions are the ones you don't ask...



Do you need the PCB? No.

Will the PCB help make it easier and hopefully eliminate many wiring errors? Yes.

I strongly suggest using the PCB for the amp and PSU. It makes things simpler and the entire process will be easier and more streamlined by using them.
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Old 8th October 2013, 12:51 PM   #13369
AndrewT is offline AndrewT  Scotland
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Originally Posted by KatieandDad View Post
It depends on what time of day. It's Katie at the moment. Dad comes home depending on what shift he is on and uses my account.
Are you both interested in Electronics?
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Old 8th October 2013, 01:21 PM   #13370
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Dad is better than I am, I only learnt electronics as part of my HND. As my boyfriend is into it all I tend to help him along sometimes. I'm more of a systems analyser than raw electronics.
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