Bun's Lab
Rik also sent me a couple voltage references. That was in fact the whole reason for the box. LM299AH, REF02, VRE3041A and LTC 6655
The LM299AH is a real classic. A precision, temperature-stabilized monolithic zener. The temperature stability is 1 ppm/°C, with 20 ppm long term stability, and a noise floor of 7 µVpp typical, 20 µVpp max between 10 Hz - 10 kHz.
The problem is that the initial reverse break down voltage is not well known. It's somewhere between 6.8 - 7.1 V. Which means, in order to build a reference using it, you need a reference to calibrate it to.
The problem is that the initial reverse break down voltage is not well known. It's somewhere between 6.8 - 7.1 V. Which means, in order to build a reference using it, you need a reference to calibrate it to.
Bun's Lab
Photo
The REF02 is a bandgap based 5V precision reference. 10ppm/°C temperature drift, 10µVpp max noise (0.1 Hz - 10 Hz) and a known output voltage of +5 +- 0.2% max. It also has a trim input to further calibrate it within a +- 6% range. The long term stability is specified at +- 100 ppm for the first 1000h, +- 50 ppm for the second 1000h.
Bun's Lab
Photo
The VRE3041A has a known output voltage of 4.094 V +- 0.409 mV, that's 0.01%. A temperature drift of 0.6 ppm/°C, noise of 3 µVpp (0.1 Hz - 10 Hz), and a long term drift of 6 ppm/1kh. It also has a trim option for < 0.01% initial error.
Bun's Lab
Photo
The LTC 6655 is a bandgap based voltage reference.
I have the 5V variant in the hermetically sealed 5x5mm LS8 package. It goes for 16 € a pop on mouser, not including taxes.
Noise is 0.25 ppm pp between 0.1 Hz and 10 Hz, with a 2 ppm/°C temperature drift, a high initial accurary of +- 0.025 % max, and a long term drift of 20 ppm/sqrt(kHr). Dope af.
I have the 5V variant in the hermetically sealed 5x5mm LS8 package. It goes for 16 € a pop on mouser, not including taxes.
Noise is 0.25 ppm pp between 0.1 Hz and 10 Hz, with a 2 ppm/°C temperature drift, a high initial accurary of +- 0.025 % max, and a long term drift of 20 ppm/sqrt(kHr). Dope af.
VRE3041.PDF
195.8 KB
Data sheets
With the power of hackjob soldering I managed to get that weird package onto a SOP14 adapter PCB. Hope it didn't cost me too many ppm. Marco Reps would NOT be proud :(
Snapped off every other leg as to not create loops
Snapped off every other leg as to not create loops
Well, that REF02 is dead :(
I'm pretty sure I didn't zap it. 10V supply results in 8.6V output, output tracks the supply voltage.
I'm pretty sure I didn't zap it. 10V supply results in 8.6V output, output tracks the supply voltage.
Bun's Lab
With the power of hackjob soldering I managed to get that weird package onto a SOP14 adapter PCB. Hope it didn't cost me too many ppm. Marco Reps would NOT be proud :( Snapped off every other leg as to not create loops
The VRE3041 seems to work perfectly, as far as I can tell at least. My crude measurement setup was very noisy in itself so I couldn't verify its noise level. Unplugging it from the breadboard gives me noise reduction of an order of magnitude - surprise surprise.
Let's have a quick look at this power supply I picked up at the Finger event. I have to admit, its mad scientist retro looks were a big part of its appeal to me. Plus I needed another lab PSU in my setup anyway and this fits in nicely. Linear supply with a big hunk of iron and copper.