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Magnetic-Radiation Remote-Control - Short-range 35KHz operation,
single-channel unit Simple circuitry, no outer antennas required (added 9/04) |
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MC145151 PLL FM Transmitter - This PLL has been designed with an old Motorola
circuit :the MC145151. The VCO is based on a "Colpitz" oscillator equiped with a
Fet Transistor.(J310) Two varicap Diodes are used in order to reduce the global
noise of the VCO. In addition,these two diodes allow the PLL to keep the lock
status through a large range of climatic conditions. An another J310 is used in
order to match the impedance between the oscillator and the fist amplifier stage.
A MSA1105 from Minicircuits increases the RF power level coming from the VCO to
+14dBm. A simple low pass filter rejects the second harmonic to -20 dB.(Worst
case) Finally, a 7 dB attenuator and a second amplifier stage (BFR96S) achieve
this radio design. ….(circuit design added 11/08) |
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MC145170 PLL FM Transmitter - In order to simplify the transmitter design,
we've used the new pll circuit from Motorola :the MC145170. This PLL includes the
prescaler and a serial standard bus called SPI. (circuit added 04/05/06) |
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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 electronic design
added 02/03/04) |
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Miniature FM Transmitter #2 - (Tony van Roon's schematic / circuit added
10/02) |
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Miniature FM Transmitter #3 - (Tony van Roon's schematic / circuit added
10/02) |
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Miniature FM Transmitter #4 - Electronic circuit (Tony van Roon's electronic
design added 9/04) |
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Miniature FM Transmitter #5 - (Tony van Roon's electronic schematic / circuit
added 08/09) |
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Miniature FM Transmitter #6 - (Tony van Roon's schematic / circuit added
08/09) |
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Miniature FM Transmitter #7 - (Tony van Roon's circuit / schematic design
added 08/09) |
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Monaural FM Transmitter - AN-543-MonauralFMTransmitter-Analog Device
Application Notes (app note added 3/06) |
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MPF102 FM Receiver - (electronic Circuit added 03/06) |
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One Transistor FM Transmitter - Transmitter uses varactor to tune the
frequency, circuit is supplied with 3 Volts. (circuit added 8/06)
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One Transistor FM Transmitter (tomzi.geo) - (electronic Circuit added 03/06) |
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PLL Exciter - This is a PLL controller that works with the VCO/Modulator that
I designed. Use these two modules together for a complete baseband-capable exciter
unit. This PLL controller features a rock-stable crystal controlled
reference,....(added 08/08/08) |
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PLL FM Transmitter - This new FM transmitter is very simple and doesn't need
any RF tuning. First of all ,we have used an integrated VCO: The POS150 from
Mini-circuits. This excellent RF circuit covers all the FM Band in a voltage range
of 4V to 8V. The Kvco factor is very stable all over the FM band, consequently, we
have applied the BF signal directly on the control voltage line coming from the
PLL.....(added 08/08/08) |
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Portable FM transmitter 1 W - This small FM transmitter includes a limiter, a
microphone amplifier and a PLL digital tuning. All the parts are placed on one
circuit board. The RF power is switchable between 1 W (HI) and 0,2 W (LO)….(design
added 08/08/08) |
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Prescaler with Counter - Digital frequency counter is being used for wide
range of applications. Digital frequency counter extensively uses digital circuits
and hence fairly good knowledge of digital circuits and of digital integrated
circuits is required to understand the operation of the frequency
counter....(6/07) |
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Quality FM Transmitter - (electronic Circuit added 03/06) |
