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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

Doug Self Preamp from Linear Audio #5
Doug Self Preamp from Linear Audio #5
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Old 31st December 2018, 05:18 PM   #1261
diyralf is offline diyralf
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Originally Posted by brian92fs View Post
Basic question on gain structure. With the default gain of 10 db, how does this translate to input sensitivity? What is the max input signal that leaves enough headroom to avoid clipping with the 17v power supply? Is this dependent on the crest factor of the source signal?

If the source is unbalanced 2Vrms / 5db, the default 10db gain structure would increase this to unbalanced 6Vrms / 16db at the output. Do I have the math correct?

The op amps can handle max 10V. 10dB means gain of ~3. If you need 1V for your power amp, al least 333mV at input is required.

Last edited by diyralf; 31st December 2018 at 05:21 PM.
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Old 31st December 2018, 11:15 PM   #1262
brian92fs is offline brian92fs  United States
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Doug Self Preamp from Linear Audio #5
Thanks! Glad to hear my math is on the right track.
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Old 7th January 2019, 10:06 AM   #1263
rock12 is offline rock12  United States
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Ordered boards about a half year ago and am now getting to them I noticed my power supply is v1.0 on my earlier build the power supply was v1.0b they are certainly not the same. Can you still order boards?
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Old 7th January 2019, 10:11 AM   #1264
jan.didden is online now jan.didden  Europe
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Originally Posted by Mixi View Post
That makes perfect sense. Thank you very much!
I believe you can also ask Frontpanel Express to anodize your panels after machining, but there's an extra cost.

Jan
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Old 7th January 2019, 03:58 PM   #1265
brian92fs is offline brian92fs  United States
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Doug Self Preamp from Linear Audio #5
The re-anodize option for Front Panel Express must be region specific. I asked about this for the US about a year ago and they said they don't offer that service.
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Old 7th January 2019, 04:36 PM   #1266
Carl_Huff is online now Carl_Huff  United States
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Originally Posted by rock12 View Post
Ordered boards about a half year ago and am now getting to them I noticed my power supply is v1.0 on my earlier build the power supply was v1.0b they are certainly not the same. Can you still order boards?
Rock12,

I've already sent you a private message that gives you an URL for the DOCs. I also wanted to let you know that I have power supply PCBs on hand should you want for use in other projects.

Of late I have been shipping a very nice 'old school' series regulated supply PCB as described back on post #1231. This one has the advantage of being easily configurable for 120v or 230v systems.
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Old 18th January 2019, 01:15 PM   #1267
rock12 is offline rock12  United States
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I have this power supply and I am looking for a BOM?
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Old 11th February 2019, 01:25 AM   #1268
hfxrzw is offline hfxrzw  Netherlands
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What is needed to change the original power supply from 115V to 230V? I've moved from the USA to Australia and need to make the change. Thanks, Rene
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Old 11th February 2019, 02:17 AM   #1269
rsavas is online now rsavas  Canada
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Looking at thread #1, see the blue transformer, it has the wiring on top, it shows two primary windings @115V each. you are to wire the primaries in parallel for 115V ( connect the 2 dots) and in series for 230V (connect the non-dot to the dot).

Last edited by rsavas; 11th February 2019 at 02:20 AM.
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Old 11th February 2019, 03:26 AM   #1270
hfxrzw is offline hfxrzw  Netherlands
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Cheers for that, understood, but as the unit is soldered to the PCB I hoped to hear if I can just cut a lead or add a bridge to the PCB to make this work.
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