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Category: Inside Circuits Views: 3027 Rank: 0 Its very simple as It uses only 3 transistors 2n2222.The Coils can be altered to change the range of reception by lowering or highering the frequency.  This circuit is a SW band reciever of range 6 to 17 MHz.
Related circuits This circuit should be useful for interfacing phone projects to the telephone line. Digital Automatic Level Control (Alc) Circuit This approach to automatic level control (ALC) makes use of digitally switched audio attenuators in the signal path. The output level of the system is sensed, compared to a reference, and audio pads are inserted via analog switches. Providing a 0-to 10-V excursion from 0.4 Hz to 100 kHz, this circuit offers both simplicity and small size. The negative cur This 12V wiper speed controller circuit uses the 555 timer. Its one of those very easy and usefull circuits! To use the indicator, switch the amplifier to mono mode and adjust the balance control until both LEDs are equally illuminated. In intrinsically safe applications, it is sometimes necessary to separate sections of circuitry by resistors which limit current under fault conditions. The circuit shown provides an accurate analogue output with effectively zero output impedance, despite having resistors in series with the... This de voltmeter, with high input resistance, uses a CA3130 BiMOS op amp and measures voltages from 10 m V to 300 V. Resistors R12 and Rl4 are used individually to calibrate tbe meter for full:scale deflection. Subcarrier Adapter For Fm Tuners Circuit Op amp Ul and its associated components comprise the 67-kHz bandpass filter. A twin-T network, comprised of four 1100-12 resistors and four 0.0022- capacitors, is connected in the feedback network of the op amp. That gives some gain at 67 kHz and heavy attenuation for frequencies above and below... One Transistor Regenerative Radio Receiver
shortwave radio VFO oscillator circuit
Comments
Henry Seaman wrote on May 17, 2011
Need to know if L2 is connected to the collector of Q2 in parallel to c3. The schematic does not show a connection, but I question that. And on the other end of L2 does it only connect with R1 and R4?
Westbob wrote on May 20, 2011
yes Henry! as you said is not so clear but you got ti right.
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