Hey so it looks like im out of luck with my tsb fakes. Would you still be Interested in trading? I saw you wanted to build a new mic with the tsbs. If ur Interested, as I dont have any use for the primo capsules Id like to trade them :)
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Re: Alctron MA-1 Schematic question
Sorry, forgot to include the schematic.?
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Re: Grounding Issue with TSB2590
#P48mems
If you are using SimpleP48, you should download the latest version of SimpleP48.pdf from my Files.? Among other issues ...
?
- 100k is almost certainly too large for TSB 2590.
- I pontificate at length on the shielding required.
?
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Re: Merging three Capsules on two Preamps?!
No problem you can power that circuit from a 9v battery sans phantom power? Best Regards,
Jules Ryckebusch?
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On Feb 11, 2025, at 14:43, martenberger92 via groups.io <martenberger92@...> wrote:
?
?
On Tue, Feb 11, 2025 at 02:08 PM, Jules Ryckebusch wrote:
The ?OPA Alice is designed for capsules without a FET, to run off of Phantom power, and to drive balanced signals into a mic preamp or recorder. It really isn¡¯t applicable for this application?
Hi Jules, thanks for clarifying.?
I checked out your M/S mic today, where you created a figure of 8 by wiring to cardioid capsules in series. And that gave me an idea?
Couldn't I then if I want to merge Stereo AB with the Mid Mono mic wire the Mono Capsule in series with the A & B capsules?
Essentially forking the Mono Capsule and feeding it then into capsule A & B. Would that be worth an experiment?
Maybe I should add: The Stereo AB will be approx, 20 cm apart. And the Mid Mic is about 30cm closer to the source as the AB. Like a mini Decca Tree.
Then I could run this three capsule on a dual channel OPA alice board provided I have added phantom power and plug it right in my Sony Cassette Recorder.?
Btw Jules, thanks a lot for creating all this amazing content!
@James B: Yes I could use my Sound Devices Recorder and I do it all the time. But this project is really all about the fun and playfulness of old school cassette recorders. But still I want to record songs and capture the ambience simultaneously. So a Stereo AB is not gonna cut it.?
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Re: Merging three Capsules on two Preamps?!
?
On Tue, Feb 11, 2025 at 02:08 PM, Jules Ryckebusch wrote:
The ?OPA Alice is designed for capsules without a FET, to run off of Phantom power, and to drive balanced signals into a mic preamp or recorder. It really isn¡¯t applicable for this application?
Hi Jules, thanks for clarifying.?
I checked out your M/S mic today, where you created a figure of 8 by wiring to cardioid capsules in series. And that gave me an idea?
Couldn't I then if I want to merge Stereo AB with the Mid Mono mic wire the Mono Capsule in series with the A & B capsules?
Essentially forking the Mono Capsule and feeding it then into capsule A & B. Would that be worth an experiment?
Maybe I should add: The Stereo AB will be approx, 20 cm apart. And the Mid Mic is about 30cm closer to the source as the AB. Like a mini Decca Tree.
Then I could run this three capsule on a dual channel OPA alice board provided I have added phantom power and plug it right in my Sony Cassette Recorder.?
Btw Jules, thanks a lot for creating all this amazing content!
@James B: Yes I could use my Sound Devices Recorder and I do it all the time. But this project is really all about the fun and playfulness of old school cassette recorders. But still I want to record songs and capture the ambience simultaneously. So a Stereo AB is not gonna cut it.?
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Re: Merging three Capsules on two Preamps?!
Forgive me if i'm way off base,? but couldn't you use your?Sound Devices Mixpre10ii multi inputs to record and "mix" your channels post production?
On Tuesday, February 11, 2025 at 02:50:01 PM EST, kennjava <ken@...> wrote:
On Tue, Feb 11, 2025 at 02:08 PM, Jules Ryckebusch wrote:
The ?OPA Alice is designed for capsules without a FET, to run off of Phantom power, and to drive balanced signals into a mic preamp or recorder. It really isn¡¯t applicable for this application?
Hi Jules,
?
I only suggested the OPA-Alice as inspiration - it showcases a suitable opamp for battery-powered use, some practical considerations around single-ended powering, and then I'd expect the OP or whoever to use standard audio opamp practice when designing the required blocks.
?
I didn't mean to imply that the complete OPA-Alice would be a drop-in solution. Sorry if that wasn't clear.
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How to combine two different capsules in one body
Hello everyone, I'm looking for a bit of advice on combining two different kind of capsules (electret and MEMS) into one microphone body. What things should I consider when in comes to phasing, polarity, ext. Not only that, but how would you overcome the challenges? I'm thinking that the microphones should be set at a 10 degree angle towards each other and no further than 1mm apart. I also realize that in my board I need to be careful with the polarity of both capsules. Do you have any ideas on the best way to mix the two signals, not to clip. Is turning down the amplification enough? or is it not that simple in this circumstance? Would love any and all advice and considerations I haven't thought of.?
Thank you everyone!
-Soundwich
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Re: Merging three Capsules on two Preamps?!
On Tue, Feb 11, 2025 at 02:08 PM, Jules Ryckebusch wrote:
The ?OPA Alice is designed for capsules without a FET, to run off of Phantom power, and to drive balanced signals into a mic preamp or recorder. It really isn¡¯t applicable for this application?
Hi Jules,
?
I only suggested the OPA-Alice as inspiration - it showcases a suitable opamp for battery-powered use, some practical considerations around single-ended powering, and then I'd expect the OP or whoever to use standard audio opamp practice when designing the required blocks.
?
I didn't mean to imply that the complete OPA-Alice would be a drop-in solution. Sorry if that wasn't clear.
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Re: Merging three Capsules on two Preamps?!
The ?OPA Alice is designed for capsules without a FET, to run off of Phantom power, and to drive balanced signals into a mic preamp or recorder. It really isn¡¯t applicable for this application? Best Regards,
Jules Ryckebusch?
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On Feb 11, 2025, at 12:50, martenberger92 via groups.io <martenberger92@...> wrote:
? The FP33 looks indeed like the one device that I would need. But it's also on the heavy side. I had some slightly bigger Audio Development stuff, but mobility and lightweightedness are King for this project.
So thanks for pointing out my conflict, I am relaxing into just using three electret capsules and then merging them.
I assume the best way would be using the OPA Alice circuit on all three capsules and then merging on them right?
Would it be better to merge before the OPA Alice circuit on the capsules side, or after between the OPA circuit and the XLR Preamps?
It seems I could relatively easy add a attenuator Pad into the the Mid Mic so I would have some degree control in merging mode.
Thanks for the feedback!
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Re: Merging three Capsules on two Preamps?!
The FP33 looks indeed like the one device that I would need. But it's also on the heavy side. I had some slightly bigger Audio Development stuff, but mobility and lightweightedness are King for this project.
So thanks for pointing out my conflict, I am relaxing into just using three electret capsules and then merging them.
I assume the best way would be using the OPA Alice circuit on all three capsules and then merging on them right?
Would it be better to merge before the OPA Alice circuit on the capsules side, or after between the OPA circuit and the XLR Preamps?
It seems I could relatively easy add a attenuator Pad into the the Mid Mic so I would have some degree control in merging mode.
Thanks for the feedback!
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Re: Grounding Issue with TSB2590
#P48mems
That wouldn't be worth a try because it just wouldn't work.
Le 11/02/2025 ¨¤ 18:18,
gerttreggertert223 via groups.io a ¨¦crit?:
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Would it be worth a try if i connected the cable shielding to
the ground of the capsule case? Or am I risking damaging
something by doing so?
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Re: Merging three Capsules on two Preamps?!
On Tue, Feb 11, 2025 at 11:33 AM, kennjava wrote:
Opti-Alice
Sorry, the right project name is OPA-Alice
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Re: Grounding Issue with TSB2590
#P48mems
On Tue, Feb 11, 2025 at 12:18 PM, @MusketenManfred wrote:
Would it be worth a try if i connected the cable shielding to the ground of the capsule case?
If you're using the simpleP48 powering scheme as specified in the Ambi-Alice instructable, grounding the capsule case will instantly and permanently damage the built-in FET. Don't ask me how I know this.
?
As mentioned, cardioid electrets are extremely sensitive to radiated hums and buzzes. You can test this by getting an empty soup can, ground the can, and carefully position it over your mic... you'll hear the buzz drop away.
?
So you need to come up with a metal mesh to shield the capsule and its wiring. Sometimes even two layers: something that shields each capsule, and then an overall mesh shield, like a metal mesh strainer.
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Re: Grounding Issue with TSB2590
#P48mems
Would it be worth a try if i connected the cable shielding to the ground of the capsule case? Or am I risking damaging something by doing so?
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Re: Merging three Capsules on two Preamps?!
On Tue, Feb 11, 2025 at 10:29 AM, <martenberger92@...> wrote:
I am aware that in a way I am describing a mixer yes. But I want this setup to be as small and light-weighted as possible and also battery powered.
It still seems that your goals are in conflict:
- XLR in with phantom power
- high performance
- mix controls or switching
- small, lightweight, simple, portable, battery-powered
?
But anyway. Off the top of my head, a first approach to DIY might look like this:
- crib some of the circuitry including opamp from the Opti-Alice project to buffer the raw capsules, to make one balanced mic preamp, and for post-mix makeup gain if necessary
- battery supply (6v or more) from alkalines or rechargeables for the opamps
- a charge pump, or 6x 9v (the rectangular PP3 type) for phantom power
besides I don't know any compact 3 channel XLR mixer with phantom power.
There are portable analog mixers available in the pro and semi-pro market. The Saramonic SR-PAX1 is a two-input mixer with phantom which might be a good starting point for modification, or combine two. Or their Smartrig+ mixer. I think Rolls offers similar mixers.
?
In the used market, the SHURE FP32 or FP33 can often be had for $200 or less. These are 3 mic in, stereo out, with phantom. Heavy little suckers.
?
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Re: Merging three Capsules on two Preamps?!
No I want to Merge a Stereo AB with a Mono Mid/vocal mic.
I want to be able to switch between:
Stereo AB, Stereo AB + mono Mic, Mono Mic?
And if I can have some degree of balancing the mono mic with the stereo that be great too. Maybe just with an adjustable pad circuit.
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Re: Merging three Capsules on two Preamps?!
Thanks for your view on this.
I have a Zoom, also a Sound Devices Mixpre10ii and many decent mics, so its not really about High fidelity or practicality here.
It's more about creating something playful and analog in nature just for the sake of it.
Yes I have been thinking also about using three electret capsules instead, too. However I would like the XLR input idea better.
I am aware that in a way I am describing a mixer yes. But I want this setup to be as small and light-weighted as possible and also battery powered.
besides I don't know any compact 3 channel XLR mixer with phantom power.
And the preamp quality of the tape recorder is really good, I dont want to decrease on quality...
Thats why I just want to switch between Stereo AB and Mid Mic or merge them.?
?
BTW: If you dont need your Sony walkman anymore, I'd happily take care of it and feed it with heartfelt music?
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Re: Grounding Issue with TSB2590
#P48mems
Yes, but the case doesn't?connect to the circuit ground (Pin-1) of the XLR's. In my instructable I run it all the way up to shield?the inner?two wires of the Mogami cable. I am also making the three?terminal Capsule into a "two terminal" by connecting S and G (Source and Ground). I have not had issues with this method and have used the 2590 in multiple projects this way.?
Jules On Tue, Feb 11, 2025 at 9:18?AM gerttreggertert223 via <gerttreggertert223= [email protected]> wrote:
They look to be shielded. ive attached a photo so you can see what im talking about.
They have Mesh in front and the body is soldered to ground on the 4 pads in the right picture. They should be grounded.
-- Best Regards,
Jules Ryckebusch
214 399 0931
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Re: Grounding Issue with TSB2590
#P48mems
They look to be shielded. ive attached a photo so you can see what im talking about.
They have Mesh in front and the body is soldered to ground on the 4 pads in the right picture. They should be grounded.
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Re: Alctron MA-1 Schematic question
S1 would allow you to disconnect the input at pin 2 (dont know why anyone would want that...), S2 selects an input impedance (~3150 ohms or 150 ohms).? The MA1 preamp is powered by +48v phantom from the following mic preamp it's plugged into. Phantom is not passed through to the MA1's input.
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