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Tester or
Instrumentation
Circuits, Page 8b
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Last Updated on:
Wednesday, November 29, 2017 05:38 AM |
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Circuits Designed by Dave Johnson, P.E. : |
- LASER/LED
LIGHT OUTPUT INTENSITY METER
This circuit uses a large 1cm X 1cm silicon PIN photo diode and a transimpedance
amplifier to measure the light power output of infrared and visible LEDs and laser
diodes. It can be modified to produce almost any milliwatts to volts scale factor.
It can be connected to either a multi-meter or an oscilloscope.
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- LIGHT
RECEIVER WORKS FROM 1KHz TO OVER 70MHz
This circuit uses one tiny C-MOS inverter IC to form a modulated light receiver with
a very fast response. It is designed around a PIN photo diode that is packaged for
use with plastic optical fibers. It can be used as an optical fiber receiver. By
using the open end of the optical fiber it can "sniff" out any modulated light
signals.
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Low Value Capacitance Meter
This circuit was originally designed to measure the volume of fluid inside a medical
syringe. As designed, it produces a zero to 5 volt output, corresponding
to a capacitance change of about 10 picofarads. With a digital voltmeter, at
its output, it can resolve a capacitance change of 0.002 picofarads or 2
femtofarads. (added 12/04)
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Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
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LM2675 5.0EVAL 1 Amp Step Down High Efficiency Simple Switcher Evaluation
Board - The LM2675-5.0EVAL evaluation board is a fully-assembled
and tested surface-mount regulator that provides a 5V±1.5% output at up to
1A, from an input of 8V to 40V. The overall efficiency is typically as high
as 90%. The operating temperature range is 0°C to +85°C. (app note
added 3/05) |
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LM2731/LM2733 Evaluation Board - This evaluation board
demonstrates the operation of LM2731/LM2733 and gives information on their
usage. The primary difference between the LM2731 and LM2733 is that the
LM2731 has a higher current internal switch FET (with lower breakdown
voltage), while the LM2733 has a higher voltage FET which handles less
current. (app note added 3/05) |
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LM2750-5.0 Evaluation Board - This evaluation board demonstrates
the operation of the LM2750-5.0 and gives information on it's usage.
(app note added 3/05) |
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Load Pulser Tests Supply's Transient Response - 04/11/96 EDN-Design
Ideas.... Modern µPs place severe demands on the transient response of the
power source. For example, Intel's P6 specification stipulates an .... EDN
is migrating links. This link is not verified. Search the "title" + "EDN"
for new link. |
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Load Simulator Maintains Constant Power - 04/11/96 EDN-Design Ideas.... EDN
is migrating links. This link is not verified. Search the "title" + "EDN" for
new link. |
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Logic designer & breadboarding system for Digital circuits - (diagram added
05/07) |
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Logic offers complementary switch control - 6-Dec-01 Issue of EDN The
complementary-switch controller in Figure 1 uses a few inverter gates to provide drive
signals for the complementary switches. Complementary-switch configurations find
widespread use in synchronous-rectification circuits, charge pumps, full-bridge
control circuits, and other circuits. The circuit in Figure 1 provides not only a
complementary drive signal but also a deadtime delay.... [Design Idea by Yen-Hsu Chen,
Analog Integrations Corp, Hsinchu, Taiwan] |
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Logic probe - This logic probe uses a single CMOS IC and shows three logic
conditions, High, Low and Pulsing. In addition if the probe input is neither hi or low
(the high impedance state of tri-output logic ic's) then no LED's will light.
Power from the logic probe is taken from the logic circui.... [Andy Collison] |
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Logic Probe (Jose Pino) - An useful and easy to build Logic Probe with Pulse
injector. An schematic of a "digital version" is included. |
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Logic Probe MkIIB - Essential for servicing all types of Digital circuits
….(diagram added 05/07) |
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Logic Probe uses Bicolor LED - 03/13/98 EDN Ideas....A project posed the
challenge of replacing existing analog potentiometers (used to set brightness and
contrast levels]in video monitors with digitally controlled potentiometers. The
different brands and models of monitors presented widely varying voltages across the
potentiometers. The design….PDF has several circuits, scroll to this one.... [Design
Idea by Mark Shill, Burr-Brown Corp, Tucson, AZ] |
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Logic probe with integral pulser function - (schematic / circuit added
05/07) |
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Logic Probe with Pulse - One of the most frustrating problems with
experimenting is not be able to check the logic state of TTL or CMOS ic's without the
use of a triggered oscilloscope. The schematic diagram above shows a simple and
inexpensive way of building a 'Logic Probe' yourself. It will provide you with three
visible indicators; "Logic 1" (+, red led), "Logic 0" (-, green led), and "Pulse"
(yellow led).…. [Tony van Roon's circuit] |
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Logic Probe with Pulse CMOS - This circuit uses the four 2 input NOR gates
contained within the 4001 CMOS IC, and is primarily intended for testing cmos
circuits. The probe derives its power from the supply of the circuit being tested. The
first gate, N1, has its inputs tied together so that it operates as an inverter, and
it is biased by R1 so that roughly half the supply potential appears at its output.….
[Tony van Roon's circuit] |
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