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  • Variable Voltage Regulator

    2017-09-11 11:45:2860

    Circuit Notes As Ron suggests, controlling the output voltage from a regulator can be made variable in three ways:- 1. Using a fixed reference zener di...

  • LM78L05 and LM79L05 supply arduino

    2017-09-11 11:06:1962

    I need to adjust voltage from two 9v batteries in such a way to have an +5v and -5v output. This is the scheme: But I have doubts. Ive checked pins on ...

  • 6-17 MHz SW reciever

    2017-09-11 09:12:5361

    Its very simple as It uses only 3 transistors 2n2222.The Coils can be altered to change the range of reception by lowering or highering the frequency. ...

  • AD736 Application circuits

    2017-09-11 08:28:5663

    AD736 is a Low Cost, Low Power, True RMS-to-DC Converter The AD736 is a low power, precision, monolithic true rms-to-dc converter. It is laser trimmed ...

  • 565Sca-demodulator

    2017-09-11 08:03:0660

    This application involves demodulation of a frequency-modulated subcarrier of the main channel. This popular example uses the PLL to recover the SCA (S...

  • Hybrid chorus with MN3007

    2017-09-11 08:00:4860

    I wanted an analogue chorus-pedal for my modular stomp-box and after acquiring a few MN3007s from Hong Kong, I decided to build the Hollis Zombie Choru...

  • Autodrum

    2017-09-11 07:24:4160

    The beat rate may be determined by operating a foot pedal in much the same manner as for a real drum, or by means of an internal oscillator, the speed ...

  • Piezo Driver Circuit

    2017-09-11 07:18:0060

    Using a PA41 from Apex Microtechnology, this monolithic amplifier is capable of 350-V operation and delivers 660 V p-p in a bridge circuit. Reprinted U...

  • Perfect Pitch Circuit

    2017-09-11 06:30:3160

    Perfect pitch, which is based on the 8751 microprocessor, is an inexpensive and easy-to-build instrument tuner/frequency counter with a built-in headph...

  • Crystal Radio A Budget DX Set

    2017-09-11 06:19:0562

    Ok folks, here comes another crystal radio. I dont build them so often anymore. Only when I have a new design to offer do I present you with another ar...

  • FM radio with TDA7000

    2017-09-11 05:29:2960

    An FM radio on a single chip requiring only a few simple peripheral components. In particular the ship requires only one simple coil and alignment is v...

  • Ranging-system

    2017-09-11 03:59:1560

    Combine an electrostatic transducer with an ultrasonic transceiver IC to build a ranging system that senses objects at distances from 4 inches to more ...

  • Narrow-band-fm-receiver

    2017-09-11 03:43:2960

    The local oscillator is crystal-controlled and the i-f swing is hardly compressed. The deviation of the transmitted carrier frequency, because of modul...

  • The Shape Pin Functions Illustrations of KA431 and TL431

    2017-09-11 03:42:2661

    TL431 is a precision voltage reference integrated circuits, some of the information referred to as voltage regulator, sampling or three-terminal integr...

  • Acorn Tube DX Receiver

    2017-09-11 03:17:2061

    This kind of looks like the last tube radio I built, doesn't it?I plead guilty here. Hope you aren't disappointed. Mylast radio was very successful. In...

  • Gated Wide-Range Vco

    2017-09-11 03:06:1560

    A CD4046 can be gated either with a switch or electronically, as shown in the figure. Frequency range of this circuit is to 1.5 kHz; use another C1 for...

  • Infra Red Extender

    2017-09-11 02:08:4460

    Circuit Notes This circuit was sent to me by Mr Guy Bocquillon from France. Now retired, and in his seventies, Mr Bocquillon keeps himself active in hi...

  • Two Radios in one - My Crystal Radio

    2017-09-11 01:47:1760

    Hi there! This is another of my recently revised radios. Not that I built them wrong to begin with, but I come across new and better materials to make ...

  • Back-up-beeper

    2017-09-11 01:26:5860

    Put the car in reverse and the circuit provides a loud, audible beep at the rate of about one per second (1Hz). Half of U1, a 556 dual oscillator/timer...

  • Vhf-modulator

    2017-09-11 00:21:1061

    This circuit uses an oscillator (2N2222) and a diode Dl as a nonlinear mixer. The frequency is set by a slug in Ll. RFCl, Cl, and RFC2 form a low-pass ...

  • The Isoscelodyne

    2017-09-10 23:53:5660

    I have a new box supplier! Still basswood but different shapes. This one is in the shape of an isosceles triangle. As with all smaller box radios, the ...

  • Electronic Cw Bug Keyer Circuit

    2017-09-10 23:53:4060

    This keyer uses skin conductivity to simulate the old-fashioned mechanical CW bug keyer. When the dit paddle is touched the bias on the inverter, ICl-a...

  • Telemetry demodulator

    2017-09-10 23:25:1160

    The circuit recovers an FM audio signal that variesfrom less than 1 kHz to about 10 kHz. Reprinted Url Of This Article: http://www.next.gr/rf/fm-circui...

  • Novel Metronome

    2017-09-10 22:40:0961

    The LM3909 is configured so that the frequency of oscillation is dependent on a single RC timing circuit, which consists of CI and R2. LED1 discharges ...

  • Pest Repeller Circuit

    2017-09-10 22:31:1260

    The two timers in the bug repeller have some interesting characteristics. Roth of them have their thresholds externally set; the oscillator on the left...

  • Pll receiver

    2017-09-10 22:25:2860

    This simple AM circuit uses a 561B. There's no inductance/capacitance tuning circuit. The 365 pF capacitor connected between pins 2 and 3 does all the ...

  • Ultrasonic bug-chaser

    2017-09-10 22:21:2060

    Low-intensity ultrasonic sound waves in the 30-45 kHz frequency band repel insects and small rodents. The unit is designed to generate a swept square w...

  • 4-Channel Mixer

    2017-09-10 21:55:4660

    The proposed mixer is designed around four current-driven transconductance amplifiers contained in an SSM2024 from Precisio n Monolithics. To obtain a ...

  • Dave's All Wave 1625 Regen Radio

    2017-09-10 21:45:2861

    Hi Friends. Here is my latest wonder radio , an all-wave set builtwith a 1625 tube. This is not my first 1625 radio. Others included my #58 converted c...

  • Sonic Defender

    2017-09-10 20:03:1360

    This oscillator-driver produces a deafening sound of about 3 kHz, modulated with a 10-Hz warble. BZ1 is a Matsushita EFB-RP3 4BZ. U1A and generate the ...

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