Pro Audio Design Forum

Assembled the first board. All working as expected. Haven't done any in-depth bench testing yet, but been listening through a few mics and it's got VERY low noise, heaps of clean gain and silent switching, so all going to plan so far!

Still waiting for the boards to arrive... I have some 22uF bipolar electrolytics I can race against the 10uF film caps. I don't mind doing some hand matching of caps because this is small batch stuff, not production. I have some ideas for running tests on low end response, but I'd appreciate some mo...

I'm keen to use the WIMA MKS2 film caps for the input and output and they only go up to 10uF. Simulations show no significant drop off or phase change at 20Hz, will see how it goes in the real world and experiment with R values if necessary. I've done a PCB design and it's off getting a small batch ...

Good point re: leaving the impedance resistor on the outside of the blocking caps, don't know what I was thinking! Did a more complete and accurate sim, was originally working on a 'half' circuit with a generic opamp model, only changed to SSM model at last stage and didn't bother updating input cir...

OK, been reading and simulating and reading and simulating... and come up with this servo design. THAT1512 PREAMP SCHEM2.pdf Simulations say it should do the trick without affecting the LF response. (Used an SSM2017 model for preamp sim and OP07 for servo, closest I could find and pretty similar for...

A few years ago I spent MONTHS trying to track down a persistent noise on my bike. It was a regular rubbery squeak, like badly adjusted brakes rubbing on the wheel, but this bike had disc brakes and it only happened when I was pedalling, so I assumed it had to be somewhere in the drivetrain. It only...

Thanks for the input so far. Input and output C networks for RF aren't on this schem because I was going to mount them directly at the I/O rather than on this PCB. I will add them for clarity and future reference before posting an updated schem. The 100R and 100uF in the 48V network is/was there for...

I figure this one is the probably the most relevant thread to continue this discussion. I've got some THAT 1512s that I will be making into some preamps for myself and a couple of friends and wanted to try and summarize the current 'best practice' implementation for this chip based on several thread...

So does this imply that if you have a vertical board (e.g. front panel mounted, eurorack or 500 series style) you should be mounting the resistors 'tall' instead of flat on the board?