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  • Emergency Siren Simulator Using 2N4401 And 2N4403

    2017-09-08 15:05:3460

    When the pushbutton is depressed, the frequency of oscillation climbs to a peak and when the button is released, the frequency descends due to the risi...

  • Michael's Radio

    2017-09-08 14:48:0060

    Introduction Hey gang! Thanks for coming back. I know my last radio description was very long winded. I promise to make this one short and sweet. Durin...

  • Scr Circuit With Self-Interrupting Load

    2017-09-08 14:29:2560

    A self-interrupting device connected to a voltage source functions as a switch that repeatedly open s and closes; therefore, the circuit does not latch...

  • Metronome II

    2017-09-08 14:17:0760

    This simple circuit uses a multivibrator to generate the beats and a subsequent audio amplifier stage to increase the output level. Range of adjustment...

  • Broadcast Band Booster

    2017-09-08 13:45:1661

    The use of a loop antenna of large size (12 18`) provides a large signal pickup at AM broadcast frequencies. It has about 18 turns. Tl is a toroidal tr...

  • Electronic-music

    2017-09-08 12:56:2261

    ICl, a 555 timer, is set up as an astable multivibrator to produce the signal that triggers IC2, a 7490 decade counter. That IC, in turn, produces a BC...

  • Very low frequency generator

    2017-09-08 12:19:1560

    Wien bridge oscillator generates frequencies of 1 Hz and 2 to 20 Hz in 2 Hz steps. Maximum output amplitude is 3 volts rms of 8 volts peak-to-peak A po...

  • Mine is bigger than yours!

    2017-09-08 12:09:2261

    Im a little ahead of schedule on my #48 radio. I hope to use this one in the 2005 crystal radio receiving contest. That is, unless I build another set ...

  • Ultrasonic Pest Repeller I

    2017-09-08 11:39:2060

    An NE555 timer is used to generate an ultrasonic signal in the 20- to 65-kHz range. The speaker is a small piezo electric tweeter with response above 2...

  • Fuzz box 1

    2017-09-08 11:25:5260

    The input signal is amplified by the transistors. The distorted output is then clipped by the two diodes and the high frequency noise is filtered from ...

  • The 6K7 DX Receiver

    2017-09-08 11:18:0761

    Since the announcement of the first one tube dx contest, I havebeen wondering what I was going to do for an entry. None of my previous setshad been bui...

  • Balance Indicator

    2017-09-08 10:44:1560

    If your amplifier is fitted with two level controls, it actually offers you a balance control and a level control. A draw back of this is that it is qu...

  • My First Crystal Set - Built As An Adult

    2017-09-08 10:43:3060

    Hello crystal set fans. Thanks for stopping by. I am proud to present my first crystal set. Heres the story: First, a little research had to be done. I...

  • Everything But The kitchen Sink

    2017-09-08 10:34:5460

    Dave's #15 crystal radio #15 is finished and it isn't even Christmas. How about that.So here is another one of my bright ideas brought to the world wid...

  • Skippy! Radio

    2017-09-08 10:04:3161

    I should have called this a Jiffy radio. I like Jif peanut butter. As I was nearing the bottom of the container, I thought that this would make a cheap...

  • Cmos Piezo Driver Circuit

    2017-09-08 09:36:3361

    A CMOS-gate and transistor buffer can be used as an effective driver for a piezoelectric transducer. Reprinted Url Of This Article: http://www.next.gr/...

  • The Kaiser's Radio

    2017-09-08 09:07:0760

    If I do say so myself, this set is a beauty. It also reminds me of those old German helmets, so I named this one after the Kaiser. I have to thank seve...

  • Fast Symmetrical Zener Clipper

    2017-09-08 08:01:2360

    The problem with using two zeners back to back in series to get symmetrical clamping is that the knee of the zener characteristics is rather sloppy. Al...

  • Guitar fuzz

    2017-09-08 06:44:0960

    The 741 has a maximum gain of 20,000, but the circuit is so designed that the IC`s gain is 2,700,000 which then distorts the output. This distortion gi...

  • 80M And 40M Cw-Ssb Receiver Circuit

    2017-09-08 05:50:3864

    This direct-conversion receiver uses a TDA7000 IC and it drives an LM386 audio amplifier. The TDA7000 is used for its mixer and L.O. section. The frequ...

  • My Crystal Set - Catwhisker Diode Detection

    2017-09-08 05:25:4160

    Is your cat missing a whisker or two? Hello again boys and girls. Before we get started, I would invite you that are new to my crystal set site to go t...

  • Loop Crystal Set - Crystal Radio

    2017-09-08 05:23:2660

    Happy New Year! This is my first radio of 2003. Well, sort of. I cheated a little. I took an existing homemade loop antenna and turned it into a crysta...

  • Connect line-level signal to phono input

    2017-09-08 05:02:5260

    Circuit description Introduction Many amplifiers have phono inputs for connecting record players tothe amplifier. Phono input is designed to take a up ...

  • irf9540 Application Circuit

    2017-09-08 04:30:4374

    IRF9540 Description Third generation Power MOSFETs from Vishay IRF9540 provide the designer with the best combination of fast switching, ruggedized dev...

  • Twatch v2 network LCD hardware design

    2017-09-08 04:24:3062

    How-to video: Open source #twatch twitter watcher with VFD screen The #twatch scrolls the latest trending topics from Twitter on an LCD screen. Its a s...

  • Hybrid mixer

    2017-09-08 03:42:4360

    ICla and b are biased into the linear regions by R3 and R4. (ICI must be 4011A) Outputs from gates are combined by op amp IC2, which provides low imped...

  • Devin and Ian Build a Crystal Set

    2017-09-08 03:28:4760

    This is how it all began. This is how it ended. Hi again friends. This will be a little different than myusual crystal sets projects. This time there i...

  • Active Antenna Ii

    2017-09-08 02:30:0263

    This circuit provides 14- to 20-dB gain at frequencies from 10 kHz to 30 MHz. The antenna length can be anything between 5 and 10 feet. A 102-inch CB w...

  • White Noise Generator

    2017-09-08 02:00:5961

    Germanium transistor Ql is used as a noise generator in the audio range. Ul acts as a high-gain amplifier. Ql is not critical; most germanium transisto...

  • License to Receive

    2017-09-08 01:35:0761

    Are you one of those closet crystalsetters ? You enjoy the hobby but you wouldnt want your family and friends to know you are receiving radio stations ...

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