Our front panels are anodized aluminum, with engraved labels. The stock SK-1DI mic preamp kit comes According to Wikipedia, Anodizing is an electrolytic passivation process used to increase the thickness of the natural oxide layer on the surface of metal parts. The process is called anodizing because the part to …
On an earlier post, I mentioned I was working on a new preamp kit. (See here) On that post, I temporarily used a vintage St. Ives Input Transformer for my prototype since I ran out of my Carnhill Input transformers. Now, I’m going to replace that St. Ives …
Fresh PCBs from factory…. back in stock! OpAmp Test Jig PCB. http://fivefishaudio.com/diy/opamptestjig/ 
The board can be configured for either Unity Buffer or Amplifier configuration. For the Amplifier configuration, it can be selected for either Non-Inverting or Inverting configuration. Gain is adjustable via jumpers from …
Every sound/recording engineer is familiar with the terms unbalanced and balanced interfaces… more commonly referred to as “unbalanced or balanced lines.” Yes, everybody knows “unbalanced line” can be very susceptible to noise (for very long runs), and that “balanced lines” are more preferred because they’re quieter, i.e. not as susceptible …
Our stock SK-1DI Mic Preamp uses a potentiometer for the gain control. It’s simple, it works, you turn the pot and you control the gain. But some users may prefer a stepped switch instead of a potentiometer, so they can precisely control the gain. It also makes “recall” easier as …
I’ve been trying to optimize performance of my new upcoming Mic Preamp Kit, the NK-72DI. It’s hooked up on my workbench to various probes and meters, and displays. I want to make sure that performance of this new Mic Preamp will be top-notch, and something my customers will be proud …
Hello folks! I’m currently working and testing a new mic preamp kit as successor to our SK-1DI 500 Series Mic Preamp Kit. I’m calling it our NK-72DI. This new mic preamp will feature Carnhill transformers, imported from the UK – the same kind of transformers used in Neve preamps and …
An opamp doesn’t know where the “Ground” is, so one can normally operate an opamp from a dual power supply (i.e. also called split power supply, dual power supply with +/-V supply voltages) or from single-supply voltages (V+ & Gnd). As long as you don’t exceed the Maximum Ratings specified …
So here’s the scenario… you have a power transformer with a voltage output of 25V + 25V AC. Let’s say, you’re using this power transformer to supply power to a power amplifier project. So it’s all good. But you also need 5 Volts DC to power some logic circuits (a …
Click here for more details about the SK-1DI Mic Preamp Kit.
Back in October 1st, we released our SK-1DI Mic Preamp Kit for the 500 Series API format. I’m happy to announce that Rev.1.2 PCB is now out, incorporating fixes and suggestions from our customers and fixing a …
