Datalogger/DataPlotter for use with Microsoft Excel or StampPlot
|Low Noise Jung Style
Super Regulator with PreRegulator (Surface Mount)
|Ultra Low Noise
(=<1ppb) Audio Oscillator
Super-Oscillator from Linear Tech's AN67
Tester for the Universal Serial Bus
JFET Tester in
Controlled Sine/Triangle/Square and Ramp Generator
|Phase Meter -
off-the shelf comparators for phase-measurement accuracy
suitable for mounting loudspeaker drivers, or measuring the
phase response of crossovers.
|Phase Meter - 1mHz to 10
MHz, 1% acuracy
think of trying this without our printed circuit board! We
implement a phase-meter using very high speed comparators and
operational amplifiers. This is the link to the article on
Intersil's website: LINK
Note, the HFA3012B is only available in the JEDEC MS-012-AB
package -- use the article as the basis for a comparable
for DIY Bode Plots
New HP465A - Noise Measurement
||We take apart
a failed HP465A amplifier and replace the gain elements and
power supply for an testing amplifier suitable for testing
regulator circuits. Included is a 0.1Hz to 10Hz filter which can
be jumpered in to the circuit, lef t out.
||To determine the
thermal impedance (Co/W) of that bargain heatsink you
picked up, use this setup.
|High Voltage Data
Acquisition Card ISOLATOR
|The Isolated MCUTracer - use
your PC to characterize tubes, transistors etc.!
|PC Controlled High Voltage Power Supply
for tube testing and matching
supply uses StampPlot to control a dual DAC/error amplifier to
generate B+ and C- voltages required for tube testing. It
mates with the MCUTracer but can be built on a stand-alone
basis. In the example shown I used a "badly"
functioning Heathkit IP-17 high voltage power supply to make a
precise computer controlled power supply.
Supply "Test Bed" for Amplifier Testing
||This is more or
less an example of how to use the innards of surplus power
supplies to create a test-bed for amplifier power supply
|An almost "lab
standard" voltage reference
the Zetex ZXFL01 bandpass/notch filter chip
still has several hundred of the ZXF36L01 chips in stock -- easy
to implement spectrum analyzer.
Packard HP3581 "wave analyzer" manual
||The HP 3581 is
an absolutely great instrument for DIYr's -- it has 140 dB of
dynamic range and a tracking generator -- couple this with a
pen-plotter (or our microprocessor plotter) and you can generate
hard copies of the response of any piece of audio
equipment. These are another EBay bargain.
TM500 and TM5000 power supply mainframes for your DIY projects.
mainframes are available for a small fraction of their original
cost. These provide
here for Link
Article From Hewlett Packard
Click here for Impedance Link
|Ultra Low Noise
Preamplifier (SQUID Amplifier)
|Dual Tracking Lab or
Bench Power Supply
exhortation for DIYr's to "buy" rather than make, I
have succombed to the desire of those in the community who
prefer the opposite. OK, if you are going to make this
supply, you might as well make it as useful and reliable as
This supply uses a high
quality thermally controlled voltage reference, good quality
error amplification techniques (which have been checked out with
the phase-gain meter for their open loop response and stability)
to provide + and - 40 VDC at 3 Amps.
As with our other
projects, a microprocessor is used. You can control the
device using a 4X4 matrix keypad or Selmaware's STAMPPLOT !