Design

FS: NEW Minicircuits ZKL-1R5 RF MICROWAVE AMPLIFIER(s) 0.01-1.5GHz. $50 on Ebay (LOT of TEN)
Mark Levitski wrote: Minicircuits ZKL-1R5 RF MICROWAVE AMPLIFIER(s) 0.01-1.5GHz. High-end Amps, MedPower +18.7dBm, Low Noise 3dB, 40dB gain. NEW - in original Minicircuits/antistatic packaging (never used). Minicircuits has put out a warning about a lot of counterfeit parts marked with their l... 28 Oct 2009 08:27

Photodiode SPICE models?
Dear all: I'm on a bit of a roll with TIA designs at the moment, but I've just been using current sources with caps in parallel to model fully-depleted photodiodes, and I need a better model to hack up. The LTSPICE Yahoo group's files area is broken at the moment. Do any of you have a decent PD model with ... 31 Oct 2009 00:21

Interesting TIA design
I just finished up an interesting new (to me) TIA design for a Far Eastern customer. (There's no NDA, so I can talk about it.) It made a pretty interesting study. It works up to about 30 uA photocurrent, but manages to be shot noise limited above 20 nA at 400 kHz and 100 nA at 1 MHz with 30 pF of photodio... 30 Oct 2009 21:05

hobbyist frequency standard
Hi gang, There seem to be a lot of surplus GPS discliplined 10MHz OCXOs on eBay lately. Anyone here have experience using a setup like that? I'm still looking into getting my lab equipped, I'm looking into the frequency thing. Besides GPS, there's the national standards. The Canadian equivalent to WWV is CHU, th... 25 Oct 2009 05:32

If you had one what would you use it for
Imagine you had a sensor that could measure very small magnetic fields. It measures with a noise floor of about 0.1fT. Unfortunately the band width is only a few hundred Hz and it only works inside a shield. What would you use such a sensor for? The best I've thought of is detecting the flow of current in a... 22 Oct 2009 23:04

Serial Port Design for Z80 - Questions
Commander Dave wrote: First, was there a better UART that I could have chosen? The 16C550 seems to have been around for quite awhile. I am looking for mainly availability and simplicity rather than cost or other factors. The "authentic" solution would be to use a Z80 SIO :-) http://vt100.net/manx/det... 20 Oct 2009 23:26

another board
ftp://jjlarkin.lmi.net/Board39.jpg This is an 8-layer mixed-signal thing. On the left is a PCIe interface to a Kontron mini-ITX sbc. Upper-right is a cluster of five spread-spectrum switching regulators, all inductor isolated from everything coming and going. I may slice some ground planes around there just... 21 Oct 2009 00:33

ZVS converter - snubber helpful at turn-off?
I am looking at doing a half-bridge LLC resonant converter design. Fairchild appnote AN-4151 Turn-on is not a problem as it is into zero voltage as the lagging current commutates the current before the Fet turns on. I am wondering if placing a small capacitor (100pf-1000pf) across the Drain-Source might help t... 15 Oct 2009 20:32

Thermostat + Timer
Hi Guys, I'm doing a hobby project to build a timer that can be used to turn on a relay at a pre-determined time and then turn it off after a delay. I also want to use a temperature sensor to override the relay but only during the time period that is programmed. The idea is to turn on a water heater for a pre-... 22 Oct 2009 09:38

Ping Larkin
John Larkin, Didn't your daughter go to Columbia University? I have a granddaughter being plied with scholarship offers. Would you recommend Columbia? Thanks! ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innov... 11 Nov 2009 22:31