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30W Class AB Amplifier - This is an instrument amplifier for monitoring music when on stage. it provides 21W output power of this little design. Previously I had a decent 10W amplifier (RED Free Circuits) , but we blew that one somehow. Now I will put this into the old box. I haven't built it yet, but the simulations say it works as I designed. in this design, wiring is important due to no differential amplifier. I might need to add ripple rejection with a zener as in the above design. __ Designed by Marc
4 Ch Digital Logic Analyzer & 5 Ch Digital Oscilloscope in Parallel Port - This is one of the simplest circuit for a PC parallel port based DLA. The circuit is mainly used to protect the port which is fabricated on the otherboard itself. The IC 74LS04 is an inverter and acts as a buffer. The Zener is used for undervoltage and overvoltage protection. if a voltage > 5V appears on the input, The buffer will not transmit this voltage to the PC. __ Designed by Huzaifa S. Sidhpurwala, India
–48V Low Side Precision Current Sense - This amplifier configuration is essentially the complementary implementation to the classic high-side configuration. The op amp used must support common-mode operation at its lower rail. A floating shunt-regulated local supply is provided by the Zener diode, and the transistor provides metered current to an output load __ Linear Technology/Analog Devices App Note, Mar 31st 2010
4-Channel Digital Logic Analyzer & 5 Channel Digital Oscilloscope by using PC Parallel Port - This is one of the simplest circuit for a PC parallel port based DLA. The Circuit is mainly used to protect the port which is fabricated on the motherboard itself. __ Designed by Huzaifa S. Sidhpurwala, India
60V, Synchronous Step-Down High Current LED Driver - 03/01/14 EDN-Design Notes This circuit provide as much better performance and higher power handling than a Zener diode The meaning of the term “high power LED” is rapidly evolving. Although a 350mA LED could easily earn the stamp of “high power” a few years ago, it could not hold a candle to the 20A LEDs or the 40A laser diodes of today. High power LEDs are now used in DLP projectors, surgical equipment, stage lighting, automotive lighting, and other applications traditionally served by high intensity bulbs Design by Hua Walker Bai, also see Linear Technology Design Note 508
7 by 10 LED Moving Sign - This sign uses two LED arrays to form a 7 X 10 matrix. it produces moving messages or animations stored in an EPROM. it uses no microprocessor. As in most electric signs, the LEDs are matrixed, and strobed very quickly. __ Designed by Bob Blick
Amplified Zener - A 13 volt Zener diode will work well for charging a 12 volt battery on Standby use. Or use a 14 volt zener a diode for a Standard 14.6 volt charge. __ Designed by G.L. Chemelec
Circuit Lets You Measure Zener Voltages & Test LEDs - 10-Jun-10 EDN Design Ideas: To measure a zener diode's breakdown voltage, you need a dc voltage source whose voltage exceeds that of the zener voltage. in Figure 1, resistor RSER provide as voltage drop between ViN and VZEN. in any case, ViN should exceed VZEN. Resistor RSER must provide current, iZEN, that can keep the zener diode in reverse breakdown. That is, the current must be more than iZEN-iZENMiN and less than iZEN-iZENMAX. You also need to consider the current that flows through the load. Otherwise, VZEN will be unregulated Design by Vladimir Oleynik, Moscow, Russia
Circuit Monitors battery voltage - 11/21/96 EDN Design Ideas: The circuit in Figure 1 monitors four NIC d rechargeable batteries and causes the LED to flash if the voltage of the batteries goes lower than 4V. The circuit consumes only 8 mA of current under normal operating conditions. IC 1 is an eight-pin IC that includes an op amp, a comparator, and a 1.2V zener diode. The zener diode connects to the negative input of the comparator in the IC as a reference. R6 and R7 divide the battery voltage Design by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA
Design Notes: 60V, Synchronous Step-Down High Current LED Driver - 03/01/14 EDN-Design Notes This circuit provide as much better performance and higher power handling than a Zener diode The meaning of the term “high power LED” is rapidly evolving. Although a 350mA LED could easily earn the stamp of “high power” a few years ago, it could not hold a candle to the 20A LEDs or the 40A laser diodes of today. High power LEDs are now used in DLP projectors, surgical equipment, stage lighting, automotive lighting, and other applications traditionally served by high intensity bulbs Design by Hua Walker Bai, also see Linear Technology Design Note 508
Four-Ch Digital Logic Analyzer & 5 Ch Digital Oscilloscope in Parallel Port - This is one of the simplest circuit for a PC parallel port based DLA. The Circuit is mainly used to protect the port which is fabricated on the motherboard itself. The IC 74LS04 is an inverter and acts as a buffer. The Zener is used for undervoltage and overvoltage protection. if a voltage > 5V appears on the input, The buffer will not transmit this voltage to the PC. __ Designed by Huzaifa S. Sidhpurwala, India
Handy Zener Diode Tester - Here is a handy zener diode tester which tests zener diodes with breakdown voltages extending up to 120 volts. The main advantage of this circuit is that it works with a...__ Electronics Projects for You
High Voltage 100mA Current Source - An external zener diodes protects the LT3092 and allows the part to be used in high voltage applications. __ Linear Technology/Analog Devices App Note, Mar 24th 2010
High Voltage Generator for Geiger Tubes - The following two circuits are an improvement over the older circuits below. The circuits are shown generating 500 volts but they may be modified to supply a couple of hundred to nearly 1000 volts by changing the zener diodes. The difference is subtle; the feedback signal increases the voltage on the base of the 2N4403 to stop the oscillator instead of stealing current from the capacitor on the emitter. The result is much lower power dissipation when there is little or no load on the high voltage __ Contact: Charles Wenzel of Wenzel Associates, Inc.
Homemade Serial to Nokia MBus Interface on a PCB, without using Zener diodes - My humble 6110 and its pinout. Solidering wires directly onto the phone does not hurt it if you were wondering. Since people have asked I have put more connection pinouts at the bottom of this page, 8810, 3310, 3210, 8210, 8250 __ Designed by M Barron
Interfacing 5 Volt CMOS
to 12 Volt loads - The circuit above is designed to be used with the bi-directional lamp sequencer shown above on this same page. Two additional transistors are used to increase the current from the 74HCT138 decoder to control 12 volt 25 watt lamps. A 6.8 volt/1 watt zener diode is used in series with the ground connection of all the CMOS
ICs (74HC14, CD4516 and 74HC138s) so that the total voltage across the CMOS
devices will be about 5.2 volts and the outputs will move from +12 to about +7 when selected. The 2N2905/PNP transistor stage is connected as an emitter follower which provides a high impedance to the __ Designed by Bill Bowden
LED Indicates Power Source - 08/26/10 EDN Design Ideas: A zener diode lets detects the presence or absence of a power source. Design by Brian Conley, PE, Circuitsville Engineering LLC
LED Moving Sign 7 x 10 - This sign uses two LED arrays to form a 7 X 10 matrix. it produces moving messages or animations stored in an EPROM. it uses no microprocessor. As in most electric signs, the LEDs are matrixed, and strobed very quickly. __ Designed by Bob Blick
Measure Zener Voltages & Test LEDs - 06/10/10 EDN Design Ideas: You can use this circuit to measure zener voltages as high as 40V. To measure a zener diode's breakdown voltage, you need a dc voltage source whose voltage exceeds that of the zener voltage. in Figure 1, resistor RSER provide as voltage drop between ViN and VZEN. in any case, ViN should exceed VZEN. Resistor RSER must provide current, iZEN, that can keep the zener diode in reverse breakdown. That is, the current must be more than iZEN-iZENMiN and less than iZEN-iZENMAX. You also need to consider the current that flows through the load. Otherwise, VZEN will be unregulated and less than the nominal breakdown voltage. Also, the power that the zener diode dissipates should not exceed the manufacturer's specifications. Except for the value of iZEN-iZENMiN, all necessary data appears in zener-diode data sheets. Design by Vladimir Oleynik, Moscow, Russia
Monitor Battery Voltage - 11/21/96 EDN Design Ideas: The circuit in Figure 1 monitors four NIC d rechargeable batteries and causes the LED to flash if the voltage of the batteries goes lower than 4V. The circuit consumes only 8 mA of current under normal operating conditions. IC 1 is an eight-pin IC that includes an op amp, a comparator, and a 1.2V zener diode. The zener diode connects to the negative input of the comparator in the IC as a reference. R6 and R7 divide the battery voltage Design by Yongping Xia, Philips Lighting Electronics Co, Torrance, CA |
