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Improved FM Stereo Modulator - (electronic circuit added 7/03)
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ISM Receiver with TDA5100/ TDA5200 - .... |
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ISM Transmitter with TDA5100/ TDA5200 - .... |
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LA1800 FM Radio - 3V superheterodyne FM receiver (08/08/08)
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Linear FM 30Watt - …. |
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Linear FM 50Watt with BLY90 - A amplifier of force RF for the
FM, is always essential for the amateur that wants it strengthens some
small transmitter, that likely already it has manufactured or has been
supplied ready. The present circuit can give 50-60W RF force of expense,
with control smaller than 15-20W in the region of frequencies of FM, that
is to say in the 88-108MHZ. Transistor that we selected
for.....(electronic design added 6/07) |
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Low Pass Filter For FM 88-108 MHz - Filter used for eliminate
unwanted harmonic frequency at second and third. Notch filter, Band Pass
Filter (BPF), and High Pass Filter (HPF) sometime combined in constructing
LPF design. Schematic below for FM Broadcast Lowpass Filter 88-108
MHz…..... |
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Low Power FM Transmitter - Useful to retransmit the hi-fi to another FM
receiver nearby, or as a wireless mic (schematic / Circuit design added 9/02)
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LowPass Filter - The schematic you find here comes from another site on the
internet, but because it's on so many sites, we don't know who actually designed it.
However it's a nice one. Capacitors: C1,C4 22pF cer. C2,C3 51pF cer. Coils: L1,L2,L3
#18 bus wire, 1/4"diameter, 3 turns * Form the leads from the capacitors as shown in
the little figure below. Then solder them from the pad to the outside ground area. *
Be sure that the turns from the coil are seperated by the same distance as the
diameter of the wire * Form the leads from the coils as shown in the little figure
below. Then solder them in place. * Place the filter in a metal box, with rf-connectors
on both ends ( SO239(=PL259), BNC or N-connectors) |
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Micro Spy with FETs - Circuit and notes only, no circuit description given….
[Tony van Roon's circuit] |
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Micro Spy with TTL - This circuit is old (70's) but since the 74LS13 is from
the regular 74xx series and easy to obtain, I decided to keep the circuit in place
until components are no longer available. Not much to tell here. Performance is
based on the 74LS13, a 'Dual 4-input Positive-Nand Schmitt Trigger'. This
circuit was experimental and so has no real purpose other than tinkering…. [written by
Tony van Roon] |
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Micro Spy with Usw - Circuit and notes only, no circuit description given….
[Tony van Roon's circuit] |
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Micropower FM BroADCasting Circuits - (schematic / Circuit design added
9/02) |
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Minature FM Transmitter - This miniature transmitter is easy to construct
and it's transmissions can be picked up on any standard FM radio. It has a range
of up to 1/4-mile (Tony van Roon's 400 meters) or more, depending on the
line-of-sight, obstructions by large buildings,etc. It is great for room
monitoring, baby listening, nature research,..... [Tony van Roon's circuit] |
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Mini Tracker - Lets you find things, using an FM radio to pick up the
beeps….(added 04/07) |
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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(added 11/05) |
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Miniature FM Spy Mic - This spy mic works from single 1.5 volts AA type
battery cell. It is highly sensitive and has a range of 300 meters. You can use any HF
transistor with cut-off freq. >300 MHz for Q. Use electret mic. (added 11/05)
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Miniature FM Transmitter - (circuit / schematic added 5/03) |
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Miniature FM Transmitter #1 - This miniature transmitter is easy to
construct and it's transmissions can be picked up on any standard FM radio. It
has a range of up to 1/4-mile (400 meters) or more, depending on the line-of-sight,
obstructions by large buildings, etc. It is great for room monitoring, baby
listening, nature research, etc..... |
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Miniature FM Transmitter #3 - Sensitive transmitter [Tony van Roon's
circuit] |
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Miniature FM Transmitter #4 - Schmatic with parts list and notes [Tony van
Roon's circuit] |
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Miniature FM Transmitter #5 - 5 transistor transmitter…. [Paul K. Sherby] |
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Miniature FM Transmitter #6 - upto 500 meter range [Tony van Roon] |
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Miniature FM Transmitter #7 - There is no thrill like the thrill you get
from operating equipment you have built yourself. If you have never built a project
from a magazine before, let this be your first--you'll see how much satisfaction and
fun you can have!… [Tony van Roon] |
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Miniature MW Transmitter - circuit diagram of simple medium wave transmitter
using BF494B. This simple transmitter have a range of 200 meters. |
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Modulation Monitor - very simple and useful circuit used to monitor on air
transmission of your low power amplitude modulated transmitter. |
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Monaural FM Transmitter - AN-543-MonauralFMTransmitter-Analog Device
Application Notes.....[App Note] |
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Morse Adaptor for your VHF/UHF FM rig - Everyone knows that the best way to
practice Morse is to use it on the air. But how do you send Morse if you don’t
have a multimode HF or VHF transceiver? Well, you could hold a microphone up to
a code practice oscillator, and hold the PTT down while pressing the key, but it’s
very clumsy, and the transmitted tone is likely to be harsh. Clearly something
better is needed…. [from Peter Parker's website] |
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Morse Code Tutor - A program (23kb) written in C++. Morse code uses dot and
dash for communication. Still it is popularly used for communication is short wave
bands. The Archive contains program source code and executable. |
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MPF102 FM Receiver - An FM regenerative receiver using a single FET and one
audio amplifier IC….((schematic / Circuit design added 9/02) |
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