Radio

Radio

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		AM Tone Transmitter	View 255
		This circuit uses a 4049 hex inverter to form an AM radio tone transmitter.

		Coilless FM transmitter	View 221
		The RF oscillator using the inverter N2 and 10.7Mhz ceramic filter is driving the parallel combination of N4 to N6 through N3.

		FM transmitter	View 208
		Colpitts oscillator. Its frequency depends on the capacitance of the vary cap diode.

		Powerful AM transmitter	View 156
		The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here.

		40 meter Direct Conversion Receiver	View 155
		Using the circuit of 40-metre band direct-conversion receiver descr- ibed here, one can listen to amateur radio QSO signals in CW as well as in SSB mode in the 40-metre band.

		Long range FM transmitter	View 222
		The power output of most of these circuits are very low because no power amplifier stages were incorporated.

		FM Transmitter with 2N2222	View 245
		The range of the transmitter when running at 9V is about 300 feet. Running it from 12V increases the range to about 400 feet.

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