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13.8 Volt, 20 Ampere linear power supply - A semi-traditional power supply for communication equipment, using negative-rail regulation with grounded pass transistors in a configuration that gives some unique advantages. __ Designed by Manfred Mornhinweg
A 12 volt Inverter-Very Basic type - This circuit will provide a fairly stable "Square Wave" Output Voltage. Frequency of operation is Mainly determined by the 220 uF Feedback Caps. Currently about 60 Hz. Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec
A Good 12 Volt Switching Power Supply - This is a good Circuit for those persons needing to Boost or drop a voltage. The Output is High Frequency, but can be Rectified and Filtered to give DC Out. When Rectifying High Frequencies, You MUST use the Appropriate types of HiGH SPEED Diodes to handle these frequencies. Normal diodes WiLL OVERHEAT and Burn out. __ Designed by G.L. Chemelec
A Simple Circuit Inverter - This circuit will provide a fairly stable "Square Wave" Output Voltage. Frequency of operation is Mainly determined by the 220 uF Feedback Caps. Currently about 60 Hz. Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec
A Simple Circuit Switching Power Supply - A Versatile and useful supply to Experiment with, Good for the Beginner to learn. This is Direct 110 VAC input. __ Designed by G.L. Chemelec
A Very Basic 12 volt Inverter - This circuit will provide a fairly stable "Square Wave" Output Voltage. Frequency of operation is Mainly determined by the 220 uF Feedback Caps. Currently about 60 Hz. Various "off the shelf" transformers can be used. __ Designed by G.L. Chemelec
Adaptive Schmitt trigger tames unruly signals - 08/12/13 EDN Design Ideas: Some biomedical, sensor, and other signals can be almost impossible to derive a clean trigger from. This circuit could help. in biomedical instrumentation (for example) , we're sometimes faced with very noisy or badly-behaved signals from which we need to derive information. in this example, I needed to "square up" a respiration signal, which can exhibit wide variations in amplitude and frequency, along with a wandering baseline. Presented here is an adaptive "super-Schmitt, " with many adjustable parameters, that did an extremely good job of taming the input signal. Design by Michael Dunn
Add a Schmitt-trigger function to CPLDs, FPGAs & applications - 10/13/05 EDN Design Ideas: For slow-slewing signals, hysteresis solves trigger problem Design by Stephan Roche, Santa Rosa, CA
Adjustable HV Output 12 Volt Switching Power Supply - The Output is Continuously Adjustable from about 20 to 190 Volts. No Transformer needed, Just a Choke Coil. __ Designed by G.L. Chemelec
AMI-to-NRZI-Direct-Conversion Tolerates Unequalized Pulse Tails - 03/06/08 EDN Design Ideas: Using a simple ECL Schmitt trigger, you can convert three-level AMi signals to NRZi. AMi (alternate-mark inversion) is a three-level—positive, zero, negative—copper-cable transmission code with the useful property of having no dc component for ease of ac coupling using capacitors or line-coupling transformers and a spectral peak at one-half the symbol rate. The zeros symbols transmit as 0V; the ones symbols transmit at half-unit intervals with alternating-line polarity to maintain the dc balance. Design by Glen Chenier
AN132 - Fidelity Testing for A to D Converters - Linear Technology AN132 __ Designed by Jim Williams - Oct 1st, 2011
AN17 - Considerations for Successive Approximation A ->D Converters - Linear Technology AN17 __ Designed by Jim Williams - Dec 1st, 1985
Bipolar Power Supply with LM317t & with LM337t Controllable with Stereo Potentiometer - introduction LM317T and LM337T are well known and low cost adjustable voltage regulators with current limiting up to around 1.5A and power dissipation up to around 20W.it is useful to have bipolar...__ Electronics Projects for You
Changes Improve Schmitt Trigger - 05/13/99 EDN Design Ideas: The classical Schmitt trigger circuit that you’ll find in textbooks provide as some noise immunity, such as for the front end of magnetic pickup in position-sensor circuits (Figure 1a]. You adjust the two threshold levelsePDF contains many circuits, scroll to find this one. Design by Ron Patrick
Circuit forms constant-current SCR - 02/01/01 EDN Design Ideas: A typical SCR (silicon-controlled rectifier) requires a trigger current, which causes the SCR structure to latch on. Once the device latches, the current through the SCR is solely a function of external component values. The SCR has no inherent ability to limit the current flow once it latches on. Current continues to flow, as long as the current exceeds a minimal value known as the holding current. The circuit in Figure 1 is similar to an SCR, because it also requires a trigger current to latch into its on state. Design by Robert Buono, Ringwood, NJ
CMOS
Schmitt Trigger IC Makes VCO - By changing the supply voltage fed to a classic 4584 Schmitt trigger type oscillator, the oscillator frequency can be changed over a range of 50:1. A 74HCU04 inverter is used at the output of the 4584 to maintain a constant TTL logic level signal. . . Circuit by David Johnson P.E.-December, 2002
Configurable logic gates' Schmitt inputs make versatile Monostables - 05/25/06 EDN Design Ideas: You can assemble a pulse-generation circuit from a simple Schmitt-input AND gate plus a resistor-capacitor timing network. However, if you need a logic function that’s not a standard catalog item, you need a Schmitt-input gate or Design by Glenn Chenier, Allen, TX
Considerations for Successive Approximation A ->D Converters - Linear Technology AN17 __ Designed by Jim Williams - Dec 1st, 1985
Contact-debouncing algorithm emulates Schmitt trigger - 7-Jul-05 EDN Design Ideas: Another approach to solving the ubiquitous contact debounce problem Design by Elio Mazzocca, Technical Consultant, Adelaide, South Australia
Convert Solar Powered Light to Flasher - The circuit converts an off-the-shelf solar powered LED path light from producing a steady state light to one that produces a flash. This circuit includes a tiny dual Schmitt trigger inverter IC which form the pulse generator and the daylight sensor circuit. The circuit produces a positive pulse, which feeds the constant current LED driver circuit.. . . Circuit by David Johnson P.E.-March, 2010
Crow Bar #1 - Depending on the setting or R1, when the voltage exceeds a certain amount, SCR1 triggers, which activates relay RY1 and opens the circuit. S1 resets the SCR by interrupting power to it. This is a simple crow-bar circuit for low amperage protection, up to 4 amps at 30V max. Adjust the SCR for a model that suits your needs. __ Designed by Tony van Roon VA3AVR
Crow Bar #2 - This circuit can be added to any power supply design that does not have additional circuit protection. When the voltage exceeds either 10V or 30V, depending on the voltage switch setting via the front panel, the zener diode ZD1 conducts and fires the gate of the SCR. This provides a short-circuit over the output voltage and in turn will blow the AC input fuse of the power supply you wish to protect __ Designed by Tony van Roon VA3AVR |
