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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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Medium range transmitter - ….(electronic schematic added 08/08) |
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Micro Power AM BroADCast Transmitters - In this circuit, a 74HC14 hex Schmitt
trigger inverter is used as a square wave oscillator to drive a small signal
transistor in a Class C amplifier configuration. The oscillator frequency can be
either fixed by a crystal or made adjustable VFO with a capacitor/resistor
combination. (added 4/02) |
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Micro Spy with FETs - (Tony van Roon's electronic diagram added 6/03) |
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Micro Spy with TTL - (Tony van Roon's electronic diagram added 6/03) |
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Micro Spy with USW - (Tony van Roon's electronic schematic / circuit added 4/02) |
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MicroPower FM BroADCasting Circuits - (electronic diagram added 6/03) |
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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 beeper bumper transmitter for vehicle and asset tracking - (schematic /
circuit added 05/07) |
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Miniature FM Transmitter
- (circuit / schematic design added 6/06) |
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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.....(Tony van Roon's circuits added 08/09) |
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Miniature FM Transmitter #2 - (Tony van Roon's electronic schematic / circuit
added 4/02) |
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Miniature FM Transmitter #3 - (Tony van Roon's electronic schematic / circuit
added 4/02) |
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Miniature FM Transmitter #4 - (Tony van Roon's electronic Circuit added 03/06) |
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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 electronic 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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Miniature MW Transmitter - circuit diagram of simple medium wave transmitter using
BF494B. This simple transmitter have a range of 200 meters. . (added 9/04) |
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Miniature tracking transmitter - (Tony van Roon's diagram added 05/07) |
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Monaural FM Transmitter - AN-543-MonauralFMTransmitter-Analog Device Application
Notes (app note added 6/06) |
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Multi Channel RC using CMOS - This transmitter has no separate on/off switch
because the joysticks switch the battery terminal. The receiver has a bigger motor to
drive the wheels and a smaller motor to drive the steering which is not proportional.
There are two speeds in forward and one in reverse. You could add an extra channel to
the receiver by using the spare latch. (added 2/05) |
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Multiband CW Transmitter - Circuit / schematic (added 02/05) |
