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Active Antenna for HF-VHF-UHF - This simple little circuit can be used for AM, FM, and Shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios __ Designed by Tony van Roon VA3AVR
Active FM Antenna Amplifier - This simple little circuit can be used for AM, FM, and Shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios __ Designed by Tony van Roon VA3AVR
ADC Driver with Single-Ended Input to Differential Output - The LT6350 is a rail-to-rail input and output low noise single-ended to differential converter/ADC driver featuring fast settling time. It converts a high or low impedance, single-ended input signal to a low impedance, balanced, differential output suitable for driving high performance differential succesive approximation register __ Linear Technology/Analog Devices App Note, Mar 31, 2010
AM-FM-SW Active Antenna - This simple little circuit can be used for AM, FM, and Shortwave (SW). On the shortwave band this active antenna is comparable to a 20 to 30 foot wire antenna. It is further more designed to be used on receivers that use untuned wire antennas, such as inexpensive units and car radios __ Designed by Tony van Roon VA3AVR
AN1282 Nanosecond, .1% Resolution Settling Time Measurement for Wideband Amplifiers - Linear Technology AN128 __ Designed by Jim WilliamsAug 16th, 2010
AN133A Closed-Loop, Wideband, 100A Active Load - Linear Technology AN133 __ Designed by Jim WilliamsOct 12th, 2011
AN47High Speed Amplifier Techniques - Linear Technology AN47 __ Designed by Jim WilliamsAug 1st, 1991
Broad Band 2Mhz Optical Fiber Receiver - If you need more sensitivity than the above circuit this circuit provides about ten times more gain. It too is designed around an inexpensive plastic optical fiber detector. . . Circuit by Dave Johnson P.E.-June, 2000
Broad Band 50Mhz Optical Fiber Receiver Version A - If the above circuit it still too slow, you can try this circuit. What it lacks in sensitivity it makes up for in speed. The circuit attaches a plastic fiber optic PIN photodiode assembly to a small box containing a small 3v battery and a standard . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
Brownout Voltage Tester - I used this circuit years ago to test AC line powered devices under 95vac line voltage conditions. It has a rating of 250 watts. . . . Hobby Circuit designed by Dave Johnson P.E.-July, 2006
Brute Force Marries Controlled Speed - Linear Technology AN133 __ Designed by Jim WilliamsOct 12th, 2011
Build an Adjustable High-Frequency Notch Filter - 02/06/03 EDN-Design Ideas Although you can obtain universal, resistor-programmable switched-capacitor filters that are configurable as notch filters, most cannot operate at bandwidths higher than 100 kHz. Further, the typically 16- to 20-pin packages do not include a continuous-time, antialiasing filter to prevent spurious signals from appearing at the output Design by John Ambrose, Mixed Signal Integration Corp, San Jose, CA
characteristics of CMOS
Logic Inverter Amplifiers - This chart shows some of the measured characteristics of three different unbuffered CMOS
logic gates, used as voltage amplifiers . . . Hobby Circuit designed by Dave Johnson P.E.-February, 2002
Clamped AC-Input Video Cable Driver - This circuit shows a means of driving composite video on standard 75Ω cable with just a single 3.3 V power supply. This is possible due to the low output saturation levels of the LT6205 and the use of input clamping to optimize the bias point of the amplifi er for standard 1VP-P source video. The circuit provides an active __ Linear Technology/Analog Devices App Note, Mar 25th 2010
CMOS
Logic Inverter Amplifier characteristics - This chart shows some of the measured characteristics of three different unbuffered CMOS
logic gates, used as voltage amplifiers. . . Circuit by David Johnson P.E.-February, 2002
Composite Amp Provides High Gain & Bandwidth - 04/28/94 EDN-Design Ideas The composite circuit in Fig 1 couples the output drive and slew rate of a current-feedback amplifier, IC2, with the low-noise and low-offset characteristics of a voltage-feedback operational amplifier, IC1. The circuit achieves gains as high as 1000, while showing little variation in frequency characteristics with gain. This circuit suits applications/ Design by Mark Sauerwald, Comlinear Corp, Ft Collins, CO
Converting a PCS Power Amplifier to 13cm Ham Radio Band - Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos
DC Stabilized 1000uV/msec Op Amp - Adding a discrete output stage provides full control of the circuit operating currents thereby obtaining very fast ac signal response. The LT1001 is used to adjust the output dc offset to a very low value, uVs, not typical for very high speed amplifier designs. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Dip Oscillator for HF - amateur radio construction projects. __ Designed by Peter Parker VK3YE
Exponential Voltage-to-Frequency Converter for Music Synthesizers - Logarithmic characteristic of BJT is used to provide an exponential control effect on V/F function. By using a multiple transistor array, a thermal stabilization circuit assures a constant operating point for the log function. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
Fast, 16-Bit Current Comparator - Precision op-amp used as pre-comparator. Schottky diodes in feedback limit output swing of amplifier to minimize slew delay. Resistive input structure can be tailored for different trip points; this one detects a current sink of >50uA at the input __ Linear Technology/Analog Devices App Note, Jun 21, 2011
FET Input High Speed Light Detector - This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz. . . Circuit by David Johnson P.E.-June, 2000
Form Push-Pull Driver using N-Ch & P-Ch Transistors - This circuit can produce high speed output signals with fast rise and full times. The unique change pump action allows the voltage of the upper P-ch device to range from millivolts to hundreds of volts. The output current is only limited by the rating of . . . Hobby Circuit designed by David Johnson P.E.-June, 2000
Gain 1000 Amplifier with 0.01% Accuracy, DC to 5Hz - With a typical open loop gain value of 20 million V/V, very high closed loop gain amplifiers can be implemented with remarkable accuracy. Even with such a high gain, the trimmed precision produces a dc output offset of only 20mV. __ Linear Technology/Analog Devices App Note, Jun 21, 2011
HF 10 watt amplifier for 18MHz using a 2SC1969/2SC1944 transistor - Ham RadioAF AmplifiersThis project and your efforts will provide you with a 0.55 3 watt input to easily 10 watt output. The two linear amplifiers are ment for use with QRP SSB/CW/FM/AM transmitters on the amateur bands 15 and 17 meters can be powered from a 12 volt DC supply. The design is a good balance between output power, physical size __ Designed by Guy Roels ON6MU
HF 10W Power Amplifier - Schematic only __ Designed by va3iul
HF 5-band MOSFET power amplifier delivering 25 watts using a IRF510 - Ham RadioAF AmplifiersThis project uses a widely available IRF510 MOSFET. This N-Channel enhancement mode silicon gate power field effect transistor is an advanced power MOSFET designed, tested, and guaranteed to withstand a specified level of energy in the breakdown avalanche mode of operation __ Designed by Guy Roels ON6MU
HF linear Amplifier with MRF454 - 100W HF Linear AmpSchematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos
High dynamic range RF Amplifier - Schematic only, no circuit description __ Designed by © 2001YO5OFH, Csaba Gajdos
High efficiency, legal limit, solid state linear HF Amplifiers - Not a project yet, but very theoretical thoughts about very practical amplifiers! __ Designed by Manfred Mornhinweg
High Speed Amplifier Techniques - Linear Technology AN47 __ Designed by Jim WilliamsAug 1st, 1991
High Speed Light Detector from FET Input - This circuit is yet another design that converts current from a PIN photo diode to a voltage. It has a bandwidth that extends beyond 50MHz . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
High Speed RGB to YPBPR Converter - An LT6559 and an LT1395 can also be used to map RGB signals into YPBPR component video. The LT1395 performs a weighted inverting addition of all three inputs. The LT1395 output includes an amplification of the R input by –324/1.07k = –0.3. The amplifi cation of the G input is by –324/549 = –0.59. Finally, the __ Linear Technology/Analog Devices App Note, Mar 25th 2010
High-Voltage, High-Frequency Amplifier Drives Piezoelectric PVDF Transducer - 24-Jul-08 EDN-Design Ideas Finding wide use in nondestructive testing, a high-voltage, high-frequency amplifier drives a piezoelectric PVDF transducer Design by Enrique Vargas, Sergio Toral, Vicente González, and Raúl Gregor, Universidad Católica Nuestra Señora de la Asunción, Itapúa Antequera, Paraguay
High-voltage, low-noise DC/DC converters - 08/07/08 EDN Technical Article: You can make a 1-kV dc/dc converter with only 100 µV of noise. Design by Jim Williams, EDN's most revered contributor, passed away in June 2011 after a stroke. He was 63.
How to build Amplifier 2x30W with STK465 - A amplifier of acoustic frequencies can be manufactured with discernible materials, despite is known so much the difficulties of finding of materials, what the problem of regulations. These difficulties are overcome relatively easily if we find amplifier in form completed __ Designed by Kyriakos Kontakos
IF/RF Gain Block State-of-the-Art Performance the Easy Way - Bandwidth has become more precious than gold. As we push more and more data wirelessly through our smartphones, tablets, GPS, and video players, the spectrum has become more crowded. Increasingly complex and efficient modulation schemes allow us to carry more MBits/mHz through the air. However, the key to these demanding __ Linear Technology/Analog Devices App Note, Greg Fung-Senior Design Engineer Oct 4th 2012
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