|
Accurate 1hz Generator - Accurate 1Hz squarewave pulses are required in stopwatches and other digital circuits. Here is a low-cost, general-purpose 1Hz signal generator without using a crystal oscillator.230V, 50Hz, single-phase AC mains is stepped...__ Electronics Projects for You
Adjustable High/Low Frequency Sine wave generator - This circuit uses the versatile MAX038 function generator. Although in this circuit some of the advanced characteristics of this IC are disabled, you can generate Sine, Triangle, Square waves (adjusting A0 and A1 pins see datasheet on www. maxim-ic. com if you want other waves, use a switch __ Designed by Jonathan Filippi
AF Generator - The sinewave generator is based on 4 op-amps which are present in a single TL084 i.c. (see fig.1). Op-amps A1 and A2 are connected to the frequency determining RC networks R5+P1a/C1 and R6+P1b/C2, respectively. in my version of the generator, P1 is replaced by a stepped attenuator (dual rotary switch with 12 positions, see above). Moreover, I have included two additional frequency ranges; thus, S1 is in my version a dual rotary switch with 5 rather than 3 positions. __ Designed by W.Mieslinger
Amplitude-Stable Oscillator Has Low Distortion, Low Cost - 11/09/00 EDN Design Ideas: The multivibrator is a common circuit that consists of an amplifier with both positive and negative feedback (Figure 1a). When the output is positive, the positive. PDF contains multiple circuits, scroll to find the one of interest Design by Moshe Gerstenhaber, Chau Tran, and Mark Murphy, Analog Devices Inc,Wilmington, MA
An Oscillator Sawtooth & Square Wave Output - Simple, Single Supply and Works Very well with Minimum Parts Count. __ Designed by G.L. Chemelec
Anton Chekhov - My LO strategy involved mixing a 16.93 MHz xtal oscillator (xtal Q = ~100K) with a 3.121 to 3.216 MHz Hartley L-C VFO. I planned to use the EMRFD Figure 4.24 method to extract low noise + distortion from the xtal oscillator and mix it with the VFO signal in a Gilbert cell mixer like the NE612. __ Contact Vasily Ivanenko
Arduino LFO Waveform Generator - This project uses an Arduino microprocessor and a DAC0808 8 bit parallel DAC to produce arbitrary low frequency oscillator (LFO) waveforms. These waveforms are useful for driving a tremolo/vibrato circuit in a guitar amplifier such as the Lil Tiger or a phaser effect such as the Liquidator __ Designed by G. Forrest Cook
Arduino LFO Waveform Generator V2 - This project uses an Arduino microprocessor and a MAX522 8 bit serial DAC to produce arbitrary low frequency oscillator (LFO) waveforms. These waveforms are useful for driving a tremolo/vibrato circuit in a guitar amplifier such as the Lil Tiger or the Hammonator 2RVT. This is a second generation version of this project, see the first version for reference. __ Designed by G. Forrest Cook
Astable Multivibrator with Very Low Power - This classic circuit draws only 200 nanoamps from a 1.5v supply . . . Hobby Circuit designed by Dave Johnson P.E.-June, 2000
Astable Ultra Low Power Multivibrator - Taking advantage of some new voltage comparators, this circuit can produce a nice square wave signal while drawing only 1.6 micro amps. With the inclusion of a diode, the circuit can also produce short pulses instead of a square wave signal . . . Hobby Circuit designed by David Johnson P.E.-December, 2004
Asynchronous Divides Frequency by 1.5 - 10/10/96 EDN Design Ideas: in some designes, you need to provide a number of phase-related clocks to various components. in most cases, you generate the needed clocks by dividing a master clock by a power of two (synchronous division). However, sometimes, it is desireable to divide a frequency by an odd or even fractional divisor. in these cases, no synchronous method exists without generating a higher frequency master clock. Figure 1 shows the block diagram of an asynchronous clock divider that provide as division by a factor of 1.5. Design by Rolf Fielder, Ferrari Electronic GmbH, Teltow, Germany
Audio Sweep Oscilator - This circuit was designed for a sound effect, but may serve other useful purposes when a basic, swept-frequency audio source is required. it produces both square and triangular wave outputs that ascend from about 80 to 730 Hertz in a repeating cycle of about 12 seconds. Appropriate component-value substitutions will yield variations in these parameters. Operation is as follows:Operational amplifier U2B and its associated components form an astable multivibrator with __ Designed by Arthur Harrison
Audio Test Oscillator - As a piece of test equipment, an audio oscillator has to be considered essential for anyone working in with hi-fI gear. Together with an audio millivoltmeter (as described in Project 16) , and even better if you have access to an oscilloscope, you will be able to make proper measurements on everything from preamps, RiAA equalisation stages (for vinyl disks) , tone controls, crossover networks, etc __ Designed by Rod Elliott ESP
Auto pulse generator senses & responds to a probed load - 02/25/13 EDN Design Ideas: Use this handy pulse generator to inject momentary power pulses into a circuit under test. Design by Raju Baddi
Automatic Timeout included with this On/Off Flip/flop Circuit - This circuit is ideal when a device needs to be turned on and off with a single pushbutton switch, but also needs to turn itself off after some period of time. With the components shown, the output will stay on for only about 20 seconds . . . Hobby Circuit designed by David A. Johnson P.E.-May, 2012
Band-pass Network - Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc
Basic RF Oscillator #1 - This circuit switches a relay at dark via a Light Dependent Resistor or LDR for short. The applications are numerous. in my application, it switches on a light with an older type movement sensor and is mounted on the top corner of my workshop with the LDR facing upwards. The Dark Activated Relay prevents that the light is triggered during daylight hours. But, it can also be used to switch led-beacon lights for your driveway, or whatever __ Designed by Tony van Roon VA3AVR
Battery-Powered LED Flashing Advertising #2 - This circuit is similar to flashing LED advertising badge #1. it uses a CD4013 dual D Flip/Flop IC . The 74HCT74 IC in #81 does not always work. As in #81, a single lithium battery will provide months of continuous LED flashing. . . . Hobby Circuit designed by David Johnson P.E.-March, 2002
Build a PIC Controlled DDS VFO 0 to 6 MHz - This is NOT meant as a detailed building instruction for a DDS VFO. it is only a few fragments from my experimental work in the shack. This is "as is" information. it may contain errors. However, my own prototype works very well. __ Designed by Johan Bodin, SM6LKM
Build a Simple Circuit Complementary-Bracket-Pulse Generator - 20-Aug-09 EDN Design Ideas: When building push-pull switching power converters or motor controllers, you often need alternating pulses with a small amount of dead time between them to minimize simultaneous conduction in output-switching devices. Switching controller ICs have this feature, but they usually operate Design by Horst Koelzow, Global Thermoelectric, Calgary, AB, Canada
Build a UWB Pulse Generator On an FPGA - 06/23/11 EDN Design Ideas: Make pulses that reach twice an FPGA's clock frequency. You can implement a digital UWB (ultrawideband) pulse generator in most FPGAs. The design lets you create a pulsed signal with a frequency that’s twice the FPGA’s clock frequency (Figure 1). A previous design relies on asynchronous delays to make pulses of the desired frequency. That design, however, requires an FPGA that supports tristate pullups, such as the Xilinx Virtex 2 (Reference 1). Design by Punithavathi Duraiswamy, Xiao Li, Johan Bauwelinck, and Jan Vandewege, Ghent University, IMEC/Department of Information Technology, Ghent, Belgium
Bus-Request Signal Generates Logic Waveform - 06/20/96 EDN Design Ideas: The scheme in Figure 1 generates accurate and repeatable logic sequences—even in presence of interrupt activity. Specifically, circuit generates 16-bit logic sequences with a resolution of 100 nsec. This circuit's repeatability is an advantage compared with or sequence-generation methods Design by Dhananjay Gadre, IUCAA, Pune, India
|
