Have an idea you need to implement? Specialties include: switching power supply design, analog circuitry, radio frequencies, EM field analysis, electromagnetic compatibility (EMC) and more. Contact or e-mail and we can make your ideas a reality!
If you're impressed with the resources here, please consider tossing a few bucks my way:
Although I don't have much equipment at this time, my capabilities are by no means limited:
Oscilloscopes and Analyzers
Primary: Tektronix TDS460 four channel DSO, 350MHz bandwidth, 15kPt memory, standard functions (no DSP board / FFT). 1996 vintage; mostly recapped.
Tektronix 475 dual channel analog, 200MHz bandwidth, 2mV to 5V/div vertical gain, sweep rate down to 10ns/div (1ns/div on ×10). 1973 vintage; recapped power supply, replaced delayed timebase potentiometer, "A TRIG" polarity switch needs replacement.
HP8590A Spectrum Analyzer, 1.5GHz frequency range, 80dB dynamic range, receiver bandwidth 1kHz-3MHz, digital controls, sweep, averaging, peak, etc. (does have poor drift/accuracy at low sweep/bandwidth)
Primary: Wavetek 193 20MHz Sweep/Modulation/Generator: <2mHz to 22MHz over 9 ranges (main); <1Hz to >100kHz over four ranges (aux); sine, triangle, square, adjustable duty cycle (both generators); FM, sweep, AM and DSB-SC modulation modes; attenuation selectable to >70dB; 50 ohm ±15V (open circuit) output. Vintage unknown; output stage replaced.
Eico 377 signal generator: 20Hz to 200kHz in four ranges; sine and square output; 0-16V RMS output with 20 and 40dB attenuation settings. Vintage unknown; various replacements and modifications have been done over the years.
Eico 322 RF signal generator: 150kHz to 34MHz (harmonics to 102MHz+); 120Hz modulation. Vintage: possibly 1959; needs recap. Calibration unknown.
Avalanche pulse generator (hand made): sub-1ns rise/fall time; PFN connection for user-defined pulse widths; typical 5V output; triggerable; repeat rate up to 100kHz.
Meters and Measurement
DMM: RadioShack 22-811: autoranging, 600V AC/DC (high impedance under 400mV; 10MΩ otherwise), 400mA/10A, ohms, capacitance, diode, frequency, duty cycle, electric field. AC bandwidth approx. 3kHz. Vintage unknown; still operating on original battery (calibration comparable to a known-good Fluke, despite the brand name).
Heathkit V-7A VTVM: AC/DC volts (11MΩ impedance), 1.5-1500V in 7 ranges. AC bandwidth >1MHz. Vintage unknown; calibrated to 5% against RadioShack DMM; partly recapped, HV diode (selenium?) and a resistor replaced; movement slightly sticky.
RCA WV-76A high sensitivity AC VTVM, 10mV to 100V FS in 9 ranges. 20Hz to 1MHz ± 1dB. Custom upgrade adds chopper-type 1mV DC mode.
Power Supplies and Equipment
Power amplifier / DC supply (hand made): 10A capacity; 0-20VDC adjustable (DC mode); ±20V range, 10kHz bandwidth, gain of 11 (amplifier mode, noninverting).
±12V regulated supply, 200mA capacity (or 400mA single output); assorted power supplies, adapters, etc., and "build my own" from transformer inventory.
High voltage DC converter module, 12V in, adjustable 200-2000V 10mA output, with x1000 sense output.
Various off-line switching supplies, up to 100W, custom output voltages (6.3V 10A, 100V 1A, 300V 300mA, etc.).
Line Impedance Stabilization Network (LISN) (hand made): 150kHz-30MHz bandwidth, 120V single phase or 240V split phase (U.S. only), 15A capacity; dual 50 ohm outputs; frequency response and input attenuation uncalibrated.
Telecom type Impedance Stabilization Network (ISN) (hand made): two common mode ports, balanced pair configuration (uncalibrated, response documented)
Variac: Superior Electric Powerstat 116, 120V input, 0-140V 9A output
Isolation transformers: 0.5 and 3kVA sizes; 120V, 240, 480V and other configurations available.
Soldering iron: Hakko FX-888: 70W, adjustable, analog temperature controlled.
Coil winding equipment: wire, bobbins, cores; assorted ferrite and laminated iron cores in inventory.
Mechanical tools: hand tools, screwdrivers, electric drill, etc.; basic sheet metal capability.
Tower style desktop: AMD Phenom II X6 1055T 2.8GHz (6 cores), ASUS M4A88T-V EVO motherboard, 8GB RAM, ASUS/NVidia GeForce GTX550Ti video (1GB, 192 CUDA cores, DX9), 250GB SATA SSD, 2×2TB SATA RAID-1, dual boot Windows XP SP3 / Windows 7 SP1 64-bit, Trinitron type HP A4576A monitor at 1600×1200×85Hz.
Laptop: HP/Compaq 8510W; Intel Core 2 Duo T9300 2.5GHz, NVidia Quadro FX 570M mobile video, 4GB RAM, 500GB SATA HDD, Windows XP SP3 32-bit, 15.5 inch 1920x1200 LCD panel.
IBM PC750-P90: Pentium I 90MHz, 64MB RAM, S3 Vision864 2MB graphics, 3.5" and 5.25" FDDs, 2× CD drive; 4GB IDE HDD, Windows 95, Linksys LNE100TX PCI Ethernet, Dell 14" LCD at 800×600 24-bit color. Vintage 1996.
Amstrad PC1640DD: Intel 8086-2 8MHz 16 bit CPU, 8087 math coprocessor installed, 640kB RAM, Paradise EGA 128kB graphics, single 360kB 5.25" floppy, 32MB RLL HDD (ST238R), MS-DOS 6.2. Vintage 1987.