![]() ![]() Here on Reverb, popular options from the Rupert Neve Designs Portico 511 500-Series Mic Pre Module with Silk to the Soyuz Microphones Launcher Inline Mic Preamp/Gain Booster are available every day at great prices. Dean Netherton liked Emulated TMS9918A using RP2040/DVI.On paper, the role of microphone preamps in the recording process is just to bump a signal up to line level, but in practice, mic preamps can play an enormous role in defining the character of your tracks.John Branthoover liked Lego Optics Lab: Laser Interferometer.John Branthoover liked Dollar Store LEGO Interferometer.peeake liked Felini - Revolutionary Pocket-Sized Electronic Lab.Kris liked EasyWelder: welder for plastic filaments.Kris liked Polyformer - Ideal Filament Recycler.pondahai has added a new project titled Vacuum tube headphone amplifier.Bobtato on A Hobson’s Coupler Leads To A Weird Engine.Jim Gurley on A Hobson’s Coupler Leads To A Weird Engine.Paul on Weird Lens Allows Light Field Passthrough For VR Headset.bunkie on Got Fireflies? Try Talking To Them With A Green LED.bebop on A Hobson’s Coupler Leads To A Weird Engine.The Commenter Formerly Known As Ren on A Hobson’s Coupler Leads To A Weird Engine.RWood on Why VR As Monitor Replacement Is Likely To Be Terrible For A While Yet.Thinkerer on Canadian Engineers? They Have A Ring About Them.ben on Canadian Engineers? They Have A Ring About Them.jawnhenry on Canadian Engineers? They Have A Ring About Them.Why not have the min gain setting open circuit for 0dB and the max gain resistor 10 ohms for 60dB? And why are the resistors all in series? It makes gain steps smoother if you are using a make before break switch, but layout and construction would be much nicer with parallel resistors and you probably won’t be fiddling with the gain live with a preamp like this. If I’m reading the schematic right they are supposed to protect the input from phantom power transients, which are limited by series resistance and not super high speed anyway. With such a low noise amp the mic will be by far the weakest link in the signal chain and cap distortion will never be audible. – Electrolytic caps really aren’t an issue unless they are passing high AC current, and even then the effect is small. – I agree that a different power supply would be easier to use, but if you don’t have issues sourcing a decently low noise 48VDC wall wart then your setup is the simplest approach. They show 1N4148 diodes, or even Schottky diodes. ![]() Here’s some caveats from THAT Corp regarding input protection. I would be more likely to go for a bipolar supply (eg +/- 15v) and then a little voltage-multiplier to generate the phantom voltage, then some of the big electrolytics could be eliminated from the audio path. ![]() I wouldn’t myself use an XLR for output unless the preamp had a fully balanced out stage, for cost reasons, and so that there’s no false assumptions that it has a balanced output. There’s a decent amount of capacitors after that stage, so I don’t know if zener noise would actually be a problem. There are no zeners in the phantom-smoothing part of the power conditioning I suspect Murray is actually refering to the ~36v regulator. I haven’t experienced noise from modern big electrolytics, but I do like paralleling them with 0.1 uf film capacitors just in case they’re not perfect at higher frequencies. Nice implementation of a near-canonical design. Posted in Misc Hacks Tagged audio, mic, microphone, phantom power, pre-amp, preamp Post navigation We’ve featured quite a few unique preamps over the years, and if you’ve been building your own, we’d love to see those too! Built into a simple case, it looks like a handsome and well-built piece of audio equipment. The design is open source, and has already been built by others on the DIYAudio forums. The PCB is designed to rely on through-hole parts and common connectors for easy assembly. gave the design switch-controlled gain levels, providing greater accuracy than a potentiometer adjustment, and the ability to supply phantom power for mics that require it. The design is also compatible with THAT1512, SSM2019, and INA217 chips as well. The design is based around the THAT1510 preamp IC, known for its good frequency response and low harmonic distortion and noise. needed just such a thing for acoustic measurement duties, and set about working up a cheap DIY design by the name of ThatMicPre. If you’re doing any serious work with microphones, you’ll typically find yourself in want of a dedicated preamp. ![]()
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