In a sealed relay, it doesn’t matter much, the corrosion/oxidation is contained.
When dealing with signal and using a toggle switch, gold is highly recommended for corrosion resistance, as there isn’t enough current to clean the contacts, a happens in larger-signal applications.
When dealing with signal and using a toggle switch, gold is highly recommended for corrosion resistance, as there isn’t enough current to clean the contacts, a happens in larger-signal applications.
Thanks. Through a rather roundabout path I also found a BOM posted for Mouser. There are no 1/4watt resistors shown for this circuit.For R18 it does not matter
I'm getting to the end of my parts procurement and thinking about fusing my BA2018. The plan is to use an Antek AS-0518 50VA transformer to power 3 VRDN boards: 1 for each BA2018 channel and 1 for a Muses/MCL kit. Looking at calculations posted elsewhere in this thread, it looks like 50VA/120V = 416mA.
Should I opt for a 0.5A fuse or a 1A fuse? I feel as if the 1A might do better dealing with turn-on peaks but I don't want to wander too far off.
Should I opt for a 0.5A fuse or a 1A fuse? I feel as if the 1A might do better dealing with turn-on peaks but I don't want to wander too far off.
Hi,
I've finish the build of the BA2018 LineStage.
Everything is Ok but i've a small oscillation on the outputs ...
_Capture 1 : Signal 1Khz / 2V PP / Volume pot @ MAX / Wavy curve ..... (Do you think it's normal ?)
_Capture 2 : No signal / Volume pot @ MAX / 10mV/div
_BA2018 LineStage :
Thank you again Mr Wayne Colburn & Community !
I've finish the build of the BA2018 LineStage.
Everything is Ok but i've a small oscillation on the outputs ...
_Capture 1 : Signal 1Khz / 2V PP / Volume pot @ MAX / Wavy curve ..... (Do you think it's normal ?)
_Capture 2 : No signal / Volume pot @ MAX / 10mV/div
- IEC EMI Filter
- Talema toroidal transformer 50VA 2x18V
- Regulated Linear Power Supply Module Dual LME49710 / MJE15032 - +/-18VDC Output
- 100K Sterero stepped attenuator
Thank you again Mr Wayne Colburn & Community !
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What was the load during the measurements?
Was the input shorted for no-signal measurements?
Can you make a fft spectrum of these signals?
Have you checked the output voltage from the regulators on the oscilloscope?
If you turn off the linestage does the oscillation disappear?
Was the input shorted for no-signal measurements?
Can you make a fft spectrum of these signals?
Have you checked the output voltage from the regulators on the oscilloscope?
If you turn off the linestage does the oscillation disappear?
Last edited:
Looks perfectly fine. Short your inputs, max your pot, then make new measurements without signal. Since it also seems to sound fine, no reason to worry.Hi,
I've finish the build of the BA2018 LineStage.
Everything is Ok but i've a small oscillation on the outputs ...
_Capture 1 : Signal 1Khz / 2V PP / Volume pot @ MAX / Wavy curve ..... (Do you think it's normal ?)
View attachment 1280230
_Capture 2 : No signal / Volume pot @ MAX / 10mV/div
View attachment 1280233
View attachment 1280232 _BA2018 LineStage :
- IEC EMI Filter
- Talema toroidal transformer 50VA 2x18V
- Regulated Linear Power Supply Module Dual LME49710 / MJE15032 - +/-18VDC Output
- 100K Sterero stepped attenuator
View attachment 1280234
View attachment 1280235
Thank you again Mr Wayne Colburn & Community !
If still an issue, post exact circuit you used with all values, and tell us what you possibly changed from the original.
Might not be relevant but I see you have one PSU and a WLS board where ground planes for L an R channels is not connected together. At least on the board.Hi,
I've finish the build of the BA2018 LineStage.
Everything is Ok but i've a small oscillation on the outputs ...
I'm looking to build a preamp and I'm wondering if this linestage is the best way to approach it.
I have a few DIY audio projects under the belt now, the Starving Student II probably being the most involved.
I'm trying to understand what it takes to bring this into reality as a fully-fleshed preamp, chassis and all.
For context, I'm looking to have, at minimum, 2 or 3 inputs (unbalanced), a volume controller, a power switch and a nice metal chassis.
Nice to haves:
And then of course, how do know how to hook all these things up together? It certainly isn't plug n' play
Thanks for taking the time to help a total newbie!
I have a few DIY audio projects under the belt now, the Starving Student II probably being the most involved.
I'm trying to understand what it takes to bring this into reality as a fully-fleshed preamp, chassis and all.
For context, I'm looking to have, at minimum, 2 or 3 inputs (unbalanced), a volume controller, a power switch and a nice metal chassis.
Nice to haves:
- remote control volume & power
- tone controls
- the linestage
- a volume pot breakout board
- a PSU (lot's of questions here .. these seems daunting!)
- any "nice to have" modules
And then of course, how do know how to hook all these things up together? It certainly isn't plug n' play
Thanks for taking the time to help a total newbie!
Well, a good place to start to understand the overall connections and such is Rod Elliott’s P88
https://sound-au.com/project88.htm
And basically you could use the BA2018 as the active part.
As for other functionality, choose or omit as you like.
Regardless, looking at P88 is a good resource in general.
https://sound-au.com/project88.htm
And basically you could use the BA2018 as the active part.
As for other functionality, choose or omit as you like.
Regardless, looking at P88 is a good resource in general.
As for other functionality, choose or omit as you like.
Dig back through the pages of posts in this thread and check out just the photos. There are some elegant versions in simple and complex execution.
- Home
- Amplifiers
- Pass Labs
- Wayne's BA 2018 linestage