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  • U2270B RFID IC

    2017-09-09 10:09:2362

    Manufactured by ATMEL, the U2270B IC forms the RF front end of a Read/Write RFID base station. Used in 125kHz RFID systems it can be used in such appli...

  • Dual Regulated PSU

    2017-09-09 08:49:3860

    Circuit Notes In this circuit, the 7815 regulatates the positive supply, and the 7915 regulates the negative supply. The transformer should have a prim...

  • The Atwater-Dave Breadboard Radio

    2017-09-09 08:15:4360

    Hi folks. I got the idea for this one from a picture of an old Atwater Kent breadboard crystal set. I know you would rather have that one than the one ...

  • Line Driver

    2017-09-09 07:24:1960

    Description: A stereo line driver for feeding long cables or buffering an audio source. Circuit Notes This preamplifier has a low output impedance, and...

  • Positive and negative 5 v output, positive and negative 12 v

    2017-09-09 07:06:1660

    Positive and negative 5 v output, positive and negative 12 v output switching power supply Chip IO1 - UC3844, IO2 - TL431C, IO3-7905, T1 - IRF830 TL431...

  • Ten-band-octave-equalizer

    2017-09-09 06:22:2960

    A series of active rffilters using National LM3481C comprises a ten-band graphic equalizer. Cl, C2, Rl, and R2 should be at least lO% with 5% preferred...

  • High-level four-channel mixer

    2017-09-09 06:18:2260

    To provide good signal-to-noise ratio, this four channel mixer amplifier controls the signal levels after the amplifiers, and then mixes them to offer ...

  • Ultrasonic pest repeller

    2017-09-09 04:43:0860

    The device emits ultrasonic sound waves that sweep between 65,000 and 25,000 hertz. Designed around a 556 dual timer, one half operated as an astable m...

  • L293B Push-Pull four Channel Drivers

    2017-09-09 04:37:2960

    The L293B is quad push-pull drivers capable of delivering output currents to 1Aperchannel. Each channel is controlled by a TTL-compatible logic input a...

  • Modular High Performance Antenna tuner and Detector Radio

    2017-09-09 04:31:2460

    This is the Crystal Radio to End all Crystal Radios . Hello there. Cant you just feel the tension rising? With this new radio I shift gears again. Larg...

  • Has Nothing To Hide!

    2017-09-09 04:08:0861

    Hi Crystal set fans! Im not keeping up my torrid 2003 building frenzy this year, but I hope you like the radios that I am building. This radio brings m...

  • BTA08 Discrete Triacs(Non-Isolated/Isolated)

    2017-09-09 03:23:5360

    Available either in through-hole or surface-mount packages, the BTA08 triac is suitable for general purpose AC switching. Its can be used as an ON/OFF ...

  • Sound-effects-generator

    2017-09-09 03:04:5560

    A variable dock-pulse generator is made up of two sections of IC1 (a 4069 CMOS hex inverter). Rl, Sl, and capacitors Cl through C6. By adjusting Rl and...

  • Crystal Radio DX Radio

    2017-09-09 00:13:4960

    Introduction Seeing double? Well, not exactly. I built two radios at once! Thats pretty good for someone that cant chew gum and walk at the same time. ...

  • 74HCT245 Octal bus transceiver; 3-state

    2017-09-09 00:09:2961

    The 74HCT245 is a high-speed Si-gate CMOS device and is pin compatible with Low-Power Schottky TTL (LSTTL).The 74HCT245 is an octal transceiver featuri...

  • Crystal Set - It's A Mystery Set!

    2017-09-08 23:12:4260

    Cant anybody stop me?!Yep, I am still at this crystal set thing. I bought more parts and I am ready to go! This set will be based on the Mystery Crysta...

  • The Loctal-Regen

    2017-09-08 23:06:0061

    Introduction Hello again friends. My last project was a crystal set. Now I am back to the tube radio construction again. I wanted to try a tubeset with...

  • 5 Minutes Time Delay using CD4093

    2017-09-08 22:28:2761

    This be delay timer circuit model to be simple. It be the character delays to close electric all appliances. By fix the time about 5 minute. It can fin...

  • Jfet Amp With Current Source Biasing Circuit

    2017-09-08 21:36:1361

    A current source (MPF102) in the source lead of bipolar transistor 2N3906 permits accurate control of drain current. Reprinted Url Of This Article: htt...

  • The "Fidelodyne" - My Radio

    2017-09-08 21:05:1660

    I didnt know that I was building this one until today. My boss man came back this morning with this neat cigar box and an idea on how my next set might...

  • 74HC373 Octal D-type transparent latch; 3-state

    2017-09-08 21:03:0461

    74HC373 is fabricated with high-speed silicon gate CMOS technology. It has the high noise immunity and low power consumption of standard CMOS integrate...

  • MOC3020 6pin DIP photocoupler, triac driver output Applica

    2017-09-08 20:36:1560

    The aim of the design was to provide a cheap compact power supply for small Cmos circuits. The circuits controlled mains equipment (fans, lights, heate...

  • Hi-ficompressor-with-pre-emphasis

    2017-09-08 20:20:2060

    The compressor contains a high-frequency, pre-emphasis circuit (C2, R5, and CS, Rl4), which helps solve this problem. Matching de-emphasis on the expan...

  • Crystal Radio real hoot

    2017-09-08 19:42:5460

    Introduction Ive been busting to tell you the story of my #70 radio! What? No spider coils, you say? Yep, this time I decided to go a less traveled rou...

  • Crystal / Tube The Multi-Radio

    2017-09-08 18:53:1261

    Update!I entered this radio configured as a hobby class set (single coil set with a wave trap) for the 2006 Crystal Set Receiving Contest. Fasten your ...

  • The Crystal Loop!

    2017-09-08 18:29:3360

    I wasnt sure where I was going to put this on my website. It is a loop, and it is a crystal set. Since my crystal set section is more organized than th...

  • The recipe for success

    2017-09-08 17:15:1060

    Did you ever do something and it turned out right ? This is one of those rare cases with me. This one turned out perfect! My #32 radio is based on my f...

  • Variable PSU

    2017-09-08 16:55:5060

    Description: A variable power supply with adjustable voltage and current outputs made with the L200 regulator. Circuit Notes Using the versatile L200 v...

  • 1750M Transverter Circuit

    2017-09-08 15:51:1160

    This circuit was described in a recent edition of an amateur radio magazine. It allows operation in the 160- to 190-kHz band with up to 1 W (license fr...

  • part II Crystal Set

    2017-09-08 15:24:5260

    Oops. I did it again. Sitting around on a Sunday morning getting over my EDT to EST fall time jet lag, I decided to do a little cleaning up around the ...

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