I.F. Amplifier:  The I.F. transformer primary has 18 turns, the secondary winding has 4 turns. The capacitors across the IFT primaries are 82pF. The input/output transformer has 12 turns, tapped at 3 turns from ground. This transformer is wound on a ferrite core. The MOSFETs are 3SK45's. The diodes in the product detector are 1N34's. I use a six pole SSB filter from a scrap CB. The centre frequency is 7.8MHz. The -6db bandwidth is about 2.5KHz. (added 2/05)

IC Forms Differential Line Driver/Receiver:  05/25/95 EDN-Design Ideas / (Electronic Circuit diagram added 03/03) - you can use the HFA1212 dual video buffer to implement differential line drivers and receivers with a minimum of external components

Induction Receiver:  formonitoring audio magnetic fields. (added 8/03)

Infra/Radio Remote Control Transmitter/Receiver:  (Electronic Schematic / circuit added 4/02)

Infrared Receiver for Sony Remotes:  receive signals from a standard Sony remote control and send the code bytes(2) received to an RS-232 port, based on PIC16C84 (Electronic Schematic / circuit added 4/02)

Infrared Transmitter and Receiver Schematic Diagrams:  (added 8/03)

JT-MB C in Low Noise High Isolation Line Receiver for Low Z Sources:  (Circuit / schematic design added 6/06)

KD7LMO Micro Beacon (PIC18F252):  (added 8/03)

Laser Transmitter Schematics:  (added 8/03)

Lightening Detector:   A VLF receiver tuned to 300 kHz designed to detect the crackle of approaching lightning. A bright lamp flashes in synchrony with the lightning bolts indicating the proximity and intensity of the storm. It has a superior RF section with a single resonance near 300kHz and plenty of sensitivity. The antenna is a telescopic antenna that extends to two or three feet. The prototype is built into a phenolic box using point-to-point wiring. The power switch is a single pole, double throw type with a center-off position. The power supply is connected to the center terminal and the speaker is connected to one of the outer terminals. Both of the outer terminals are also connected to the other circuitry through a couple of silicon diodes, one from each terminal. One diode keeps the speaker from getting power in the 'speaker off' position and the other diode is simply there so that the circuitry sees the same voltage in both 'on' positions.  Alternately, a switch could be added in series with the speaker to turn it off. After one storm, you will add the switch if you don't include it at first!   (added 6/03)

Low Cost 4Mbps IRD Receiver in MS8 and SO-8 Package (LT1328):  DN152 -  Design Notes (Linear Technology) (added 1/06)

Low Cost‚ High Performance Receiver for Wireless Applications (1/16/94) :  Application Note - California Eastern Laboratories - Doc #904  (Circuit / schematic design added 6/06)

Low Power RS-232C Driver and Receiver in CMOS:  National Semiconductor Application Note 05 Oct1998 / (Electronic circuit added 5/02)

Low-Power IC Packs GPS Receivers (7/31/01) :  Application Note - California Eastern Laboratories - Doc #953  (Circuit / schematic design added 6/06)

LT1328: A Low Cost 4Mbps IRDA Receiver in MS8 and SO-8 Package:  DN152 -  Design Notes (Linear Technology) (added 1/06)

Miniature FM Radio Receiver using TDA7088:  The electronic diagram of the monophonic FM receiver made with TDA7088T is shown on Pic.4.12. If built with SMD components it can be placed in a matchbox, altogether with two button-type batteries. The operating principle of this device is given in the previous chapter. The only thing new is a very simple audio amplifier made with BC547 transistor, which is loaded by cheap 16-Ohm headphones. The telescopic antenna is used, as on Pic.4.8.   Small mishap of this receiver is that it has no indication of station tuning. This problem can be solved by adding a small voltmeter in parallel to the BB909, whose scale is graduated in MHz, as described in the Appendix. This solution is not appropriate for the miniature receiver, since the voltmeter that has the scale that is big enough takes too much space. It is in this case better using a manual tuning instead of automatic. Such solution is given on Pic.4.13. The tuning is done via the variable capacitor C with numbers written on its button, similar to that on Pic.3.11. It is most simple to use numbers from 1 to 10. The variable capacitor is like the one on Pic.4.8. Some experimenting is to be done with capacitances of Cx and Cy, in order to cover the entire reception bandwidth, from 88 till 108 MHz....   (added 11/05)

MK484 AM Receiver:  A complete AM radio set based on the MK484 IC (formerly ZN414). It uses a PNP transistor and can drive a 150R loudspeaker.   (added 11/05)

MPF102 FM Receiver:  (Electronic Schematic / circuit added 4/02)

MPF102 Receiver:  (added 8/03)

MRX 40 Mini Receiver:  (added 8/03)

One Transistor Regenerative Receiver:  (added 8/03)

OpAmp Radio:  (Electronic Schematic / circuit added 4/02)

OPT201 Laser Receiver:  (added 8/03)

OPT301 Laser Receiver:  (added 8/03)

Passive detector receiver keeps you informed entertained during flights:  05/12/05 EDN Design Ideas  / (added 11/05)  Receive HF AM signals without battery power.

Q Multiplying Loop Antenna: :  (Electronic Schematic / circuit added 4/02)