Signal Generators

Signal Generator Circuits

Signal Generators: #'s - B C - L M - S T - Z

Last Updated: November 22, 2021 02:42 PM

Circuits Designed by Dave Johnson, P.E. :

1 Second One Shot Circuit - This timer circuit draws only 3ua of current, and can be powered by DC supplies ranging from 3v to 15v. The circuit produces accurate pulses whose time can easily be adjusted, based on the R1 x C1 time constant. The time should not change, . . . Hobby Circuit designed by David A. Johnson P.E.-September, 2010

10 Second Ultra Lower Power Oscillator - This circuit works much like the classic 555 timer, but draws only about 1.5 microamps from a 3 volt battery. it is highly stable under varying temperature and supply voltages. . . Circuit by David Johnson P.E.-May, 2000

100Khz Low Power Light Receiver - By starving a high speed logic inverter for current, this circuit can produce a sensitive 100KHz light receiver circuit, which is immune to ambient light, but only drawing 100 microamps from a 3 volt supply . . . Hobby Circuit designed by David Johnson P.E.-April, 2005

125Khz LC Oscillator - This circuit adds more invertors in parallel to deliver more power. it is similar to CMOS iNVERTERS FORM 125KHZ OSCiLLATOR. Please note that the values shown are for 125KHz.. . . Circuit by David Johnson P.E.-March, 2002

125KHZ Medium Power Ocsillator - This circuit is similar to MEDiUM POWER 125KHZ OSCiLLATOR but adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz . . . Hobby Circuit designed by Dave Johnson P.E.-March, 2002

125Khz Oscillator from CMOS Inverters - This circuit inverts the LC components so the inductor is grounded. Two inverters are needed to produce the needed oscillation. Again, the values shown set the frequency at 125KHz but can be changed to produce other frequencies. . . Circuit by David A. Johnson P.E.-March, 2002

125khz Oscillator with Medium Power - This circuit adds even more inverters in parallel to deliver yet more power. The values shown are for 125KHz . . . Hobby Circuit designed by David Johnson P.E.-March, 2002

125Khz Ultra Pure Sine Wave Signal Source - For some RFID systems operating at 125KHz, a very low distortion signal source reference is needed. The circuit shown on this page produces a 10-volt peak-to-peak signal into a 50-ohm load, with a distortion of only 0.01% . . . Hobby Circuit designed by David Johnson P.E.-February, 2002

Capacitance Proximity Switch
Draws very low power - Ideal for battery-powered applications
6 Models Available - Call 806-778-8407

Links to electronic circuits, electronic schematics and designs for engineers, hobbyists, students & inventors:

1 Hz Pulse Frequency Generator - Here is a 1Hz pulse/frequency generator using the popular timer IC 555 which is wired as an Astable Multivibrator. The output pulses can be indicated visually by the LED. An Astable Multivibrator, often called a free-running Multivibrator, is a rectangular-wave generating circuit. Unlike the Monostable Multivibrator, this __ Designed by D Mohankumar

0.3V Crystal Oscillator with Buffered Output - Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

0.5V Crystal Oscillator with Output Buffer - Circuit ideas for Designers App Note__ Advanced Linear Devices, Inc

1 IC 2 Tones Siren Double Tone Police Sound Single Tone Old AM bulance Sound - This circuit is intended for children fun, and is suitable to be installed on bicycles, battery powered cars and motorcycles, but also in models and other games. With SW1 positioned as shown in the circuit diagram it reproduces the typical dual tone sound of Police __ Contact Flavio Dellepiane, fladello @ tin.it

1 Second Time Base from Crystal Oscillator - The schematic above illustrates dividing a crystal oscillator signal by the crystal frequency to obtain an accurate (0.01%) 1 second time base. Two cascaded 12 stage counters (CD4040) form a 24 stage binary counter and the appropriate bits are gated together to produce the desired division. Using a crystal of some even multiple of 2 is desirable so that one stage of the counter automatically toggles every second which eliminates the need for the NAND gate and reset circuitry, however the circuit below illustrates using a crystal which is not an even multiple of 2 and so requires additional __ Designed by Bill Bowden

10-octave audio generator speeds test - 07/07/94 EDN Design Ideas: Testing frequency response of an audio device typically requires a sine-wave oscillator, an ac voltmeter or an oscilloscope, and an operator to record response of device at several frequencies across. Design by Wayne Sward, Consultant, Bountiful, UT

12v Touch Switch Exciter Circuit - This circuit is designed to generate a 20KHz pseudo sine wave signal that can power about 50 remote touch activated switch circuits. it can support a cable length of about 2500 feet. A typical remote switch circuit is also shown as well as a receiver circuit for those switches.. . . Circuit by David Johnson P.E.-February, 2002

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Signal Generators: #'s - B C - L M - S T - Z