Position: Index > Unclassified >
  • TDA7021T FM integrated radio receiver circuit design

    2018-11-14 07:59:0559

    Radio Circuits Using the TDA7021T integrated radio receiver circuit can be designed a very simple high efficiency portable radio receiver circuit fully...

  • Whip Antenna Operating At Medium Wave Frequency

    2018-11-14 07:24:3159

    Figure 1 Designing the circuit for this antenna to be telescopic makes it collapsible where it can be extended to its full length or retracted to a sma...

  • How to build Timed Beeper

    2018-11-14 07:15:0559

    Beeps 7.5 seconds after a preset time Adjustable time settings: 15 sec. 30 sec. 1 min. 2 min. others Circuit diagram Parts: R1 220R 1/4W ResistorR2 10M...

  • Variable Voltage Regulation

    2018-11-14 07:07:5759

    Variable Voltage Regulation Notes: As Ron suggests, controlling the output voltage from a regulator can be made variable in three ways:- 1. Using a fix...

  • How to build Triangle / Squarewave Generator

    2018-11-14 07:01:5059

    Circuit diagram Here is a simple triangle/squarewave generator using a common 1458 dual op-amp that can be used from very low frequencies to about 10 K...

  • How to build 12V Fan Directly on 220V AC

    2018-11-14 06:32:1859

    Description This circuit idea is certainly not new, but when it comes to making a trade-of between using a small, short-circuit proof transformer or a ...

  • Sound Effects Generator 2 Circuit

    2018-11-14 06:09:0260

    Sound Effects Generator 2 Circuit Description: This circuit uses the Holtek HT2884 IC to produce 8 different sound effects. Circuit diagram Notes: All ...

  • Increasing 78xx Voltage Regulator Current

    2018-11-14 05:49:0159

    Figure 1 Shown in the figure is an IC voltage regulator (also known as stabilizer), designed to increase its current output with the use of an outboard...

  • Sensitive DX TRF Receiver

    2018-11-14 05:47:0759

    Sensitive DX TRF Receiver Description: This is a perfect broadcast direct TRF receiver. It is designed for the detection of AM signals in the 150kHz to...

  • How to build CMOS Toggle Flip Flop Using Push Button

    2018-11-14 05:33:2160

    Description The circuit below uses a CMOS dual D flip flop (CD4013) to toggle a relay or other load with a momentary push button. Several push buttons ...

  • Solid State Tesla Coil/High Voltage Generator Circuit

    2018-11-14 05:15:5759

    Solid State Tesla Coil/High Voltage Generator Circuit This is a fun and useful circuit for demonstrating high frequency high voltge. It can produce up ...

  • How to build A Tan Timer Circuit Diagram

    2018-11-14 04:44:2559

    Description This timer was designed for people wanting to get tanned but at the same time wishing to avoid an excessive exposure to sunlight. A Rotary ...

  • How to build USB Operated Home Appliances

    2018-11-14 04:27:3659

    Circuit diagram: Description When turning a computer on and off, various peripherals (such as printers, screen, scanner, etc.) often have to be turned ...

  • DS1621 PC Thermometer Requires No External Supply

    2018-11-14 04:08:5560

    Figure 1 Here is a tiny DS1621 based PC thermometer using PCs RS232 port for transferring data and getting the power. It displays the measured temperat...

  • How to build Cricket Chirping Generator Circuit Diagram

    2018-11-14 04:07:3059

    Description This circuit generates an astonishingly real imitation of the chirping of the cricket. A suitable audio wave form is generated by IC2 and r...

  • How to build CMOS Toggle Flip Flop Using Laser Pointer

    2018-11-14 03:28:0460

    Description The circuit below is similar to the one above but can be used with a laser pointer to toggle the relay rather than a push button. The IR ph...

  • How to build Room Noise Detector Circuit Schematic

    2018-11-14 02:53:4259

    Description This circuit is intended to signal, through a flashing LED, the exceeding of a fixed threshold in room noise, chosen from three fixed level...

  • How to build 5 Band Graphic Equalizer

    2018-11-14 02:14:2361

    Description Other one unit of graphic EQ. five bands. The basic difference with the other circuits is, that I use instead of IC, transistor and the pow...

  • How to build One Of Nine Sequencer

    2018-11-14 02:12:5360

    Description This novel circuit uses a flashing LED as the clock input for a 4017 decade counter. Typical flashing LEDs (eg, DSE cat Z-4044) flash at ab...

  • How to build ZN414 Portable AM Receiver

    2018-11-14 00:58:0959

    Notes: Designed around the popular ZN414 ic this receiver covers the AM band from 550 - 1600 KHz with the values shown. For Longwave the coil needs to ...

  • How to build 12V Dimmer

    2018-11-14 00:28:4559

    Description A dimmer is quite unusual in a caravan or on a boat. Here we describe how you can make one. So if you would like to be able to adjust the m...

  • Regenerative Receiver with Dual Polarity

    2018-11-14 00:25:2859

    Figure 1 The circuit has been designed to function as amplifier-detector to produce high quality of audio output through the external earphone. Receive...

  • How to build Multitone Siren

    2018-11-13 20:59:3860

    Description This multi-tone siren is useful for burglar alarms, reverse horns, etc. It produces five different audio tones and is much more ear-catchin...

  • How to build Static Electricity / Negative Ion Detector

    2018-11-13 19:19:5259

    Circuit diagram Notes This circuit relies upon the extra high input impedance of a FET, and also demonstratesthe gate terminals sensitivity to changes ...

  • How to build Environmentally-friendly Mosquito Repeller

    2018-11-13 18:47:2159

    Description With the return of the fine weather, you’ll doubtless be enjoying lazing around of an evening on your patio or in your garden, but even i...

  • How to build Solar Cell Voltage Regulator

    2018-11-13 18:19:4659

    Description This device is designed to be a simple, inexpensive ‘comparator’, intended for use in a solar cell power supply setup where a quick ‘...

  • Shortwave MK414-Designed Receiver

    2018-11-13 17:42:2359

    Figure 1 The circuit replaces the old circuit that uses ZN414 with a newer MK414 IC but still integrates the same features. It features high quality au...

  • How to build Signal Tracer and Injector

    2018-11-13 17:19:0059

    Description: A simple test circuit to fault find audio and radio equipment. Can be used to inject a square wave signal, rich in harmonics, or used with...

  • UC3706 High Current Push-Pull Output Circuit Diagram

    2018-11-13 16:42:0659

    A single output PWMs is converted to high current push-pull circuit configuration using UC3706 dual output driver series is provide on below schematic....

  • The Link 4 0 Internal Intercom Circuit

    2018-11-13 16:20:5459

    The Link provides four internal intercom phones with no outside line access. Circuit diagram The Link 4 0 This version of the Link is for those who rea...

Maybe you like