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Old 6th August 2003, 01:02 AM   #51
7V is offline 7V  United Kingdom
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Quote:
Originally posted by SY
Oh great, thanks a lot Steve, now I'm afraid to go to the dentist.
Brilliant! Still laughing every time I read it.
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Old 6th August 2003, 01:09 PM   #52
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Gonna go for dipoles...been reading linkwitz...here is my crossover + EQ..

Thoughts?
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Old 6th August 2003, 01:13 PM   #53
SY is offline SY  United States
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Two thoughts- buffer the input and mount all the frequency-determining components in such a way that they can be easily replaced.
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Old 6th August 2003, 01:21 PM   #54
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Hi Sy,

Easy enough with the EQ. The rest is gonna be built on circuit board by Gary Kaufmann. Any ideas? ..or should I just put it all together with clip leads first...and build the final version on the pcb...Guess the last option heh :-)

Quote:
buffer the input
Why should I buffer?...just curious...I'd hate to put even more circuitry between pre-amp and power amp.

The preamp is transformer coupled with 600ohm output impedance...(Just for info..don't know if that is useful to know or not)



Cheers,
Bas
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Old 6th August 2003, 01:42 PM   #55
SY is offline SY  United States
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If you're certain about your low source impedance, then the buffer may be superfluous. I'd still be inclined to use it- a sonically transparent buffer is no big deal. And, of course, you'll need to be sure that the input of the next amp in the chain is sufficiently high that you don't have to buffer the output.

One way that I've used to construct circuits that will be tuned is to build the board, but solder turrets or flea clips or some other sort of terminal in the holes for the frequency-determining components. That way, the components can be soldered and unsoldered from the top of the board with little danger. Some EQ designs even put those components on a plug-in header, but I'm always nervous about adding plugs and connections in the signal path for reliability reasons.
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Old 6th August 2003, 02:44 PM   #56
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Quote:
If you're certain about your low source impedance, then the buffer may be superfluous.
On the original Steve Bench schematic..the specs are as follows.

Input impedance smaller than 10k (Check)
Output impedance larger than 100k (Check)

So no buffers needed.


This follows Bas's first law:
Keep it as simple as possible!
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