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This web page describes a small, single tuned circuit regenerative receiver primarily for daylight reception in the 16, 19, 22 and 25 meter international shortwave broadcast bands. Quick Manuscript Submission - The procedure of submitting your manuscript is easy and quick.
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The targeted readership will primarily include scientists working on molecular and cellular bases of regeneration, physicians implementing novel strategies of molecular and stem cell therapy, and teams conducting the clinical trials in regenerative medicine. This RF amplifier stage has been incorporated into the regenerative receiver with a separate Q-multiplier and detector stage, schematic see below.
The advantages of a regenerative receiver with a tuned RF amplifier stage is that both the sensivity and the selectivity are improved, that the aerial cannot influence the regenerative circuit, and that unwanted signals while oscillating the regenerative stage aren't transmitted via the aerial.
The oscillator can be synchronised onto the RF signal coming from the tuned RF stage, in this case it is in fact a direct conversion receiver. My question if it matters for the gain and noise level if I use the J-FET BF245C in stead of the bipolar one BF494 as the second transistor in the cascode RF amplifier. In my opinion a Regen does need an RF amp, But NOT for Gain(sensitivity), or for Selectivity! Isolation of the antenna - to prevent antenna loading effects as well as prevention of the regen detector from radiating out of the antenna.
But in the 1930s during the Great Depression regenerative receivers with a tuned RF stage were very common.
DrM wrote:But in the 1930s during the Great Depression regenerative receivers with a tuned RF stage were very common.
This AM receiver classic design, revamped to use a transistor instead of a vacuum tube applies the principles of regenerative receivers which essentially means that the transistor stage has high levels of positive feedback at a certain frequency the frequency of desired tuning. This am regenerative receiver circuit project use four 1.5 volt battery cells in series as a power source, or, you can use a 6 volt DC battery or even a 9 volt battery . This am regenerative receiver circuit works over 1000-mile range (around 1600 km) with a four-foot antenna. L1 coil must have a 36 turns of #22 on a 4-inch form and C6 capacitor must have a value of 365pf (or L1=72 turns; C6=125pf ).


To adjust this am receiver you must tune R1 until oscillation occurs; back off until is ceases. CAPTCHAThis question is for testing whether you are a human visitor and to prevent automated spam submissions.
Regenerative Graffiti and abstract shapes, KASO - Roar (down in the picture).LOOK AT THE SKY, DANGER! New abstract graffiti from Kaso this time in Czech Republic from Kaso.Thanks Olga for pictures. This is a two tube regen or regenerative receiver: one 1T4 detector and one 3V4 audio amplifier. I have attempted to incorporate every improvement I have thought of into this receiver, including maximum mechanical rigidity and electrical shielding. It is accomplished by stimulating patientsa€™ natural healing abilities with bio-engineered molecules, as well as by therapeutic deliveries of bio-engineered cells.
JSciMed Central also brings multiple internationally peer reviewed member journals under one roof thereby encouraging knowledge sharing, collaboration and promotion of interdisciplinary science. The Miller capacitance between the Drain and Source of the J-FET BF245C are eliminated by the low input impedance of the transistor BF494. On this way I have built a regenerative receiver with two tuned circuits to enhance the sensivity and selectivity.
For the second tuned circuit I have used a green 10.7 mHz TOKO coil which I also used at first for the input circuit. If you connect a mother jack connector like in the circuit diagram , you can use a headset speakers .
Place a single layer of electrical tape around the bottom winding of the coil (L1); wind 6 turns of 19- or 20-gauge wire over the taped winding, leaving 4" pigtails. This receiver is suited for reception of AM signals with the regenerative stage not oscillating. This journal aims at creating a forum for advancing science elucidating foundations for molecular and cellular bases of regenerative medicine. These airplanes were not just crossing the sky, they also spraying some white substance!!I was staring at skys for few hours, these white trails were spreading to all my view and quite rapidly created a sort of hazy fog. This circuit is highly selective and very sensitive, only requiring a short antenna of at about 4 to 20 feet. The high voltage battery is constructed from 5…nine volt batteries soldered in series, which produces the 45 Volts required for the plates of the tubes. This receiver will challenge any superhetrodyne in it’s ability to pull in stations from around the world.


The two 2N3904 transistors are connected in a Darlington high-input-impedance circuit configuration to reduce loading of the tuned circuit. Chemtrails!!Please watch the video below for better understanding Chemtrails.What are Chemtrails?If you watch the sky for a few days you will see them. The RF stage immediately following the antenna has an input impedance high enough so that the signal voltage on the antenna is essentially transferred to the gate of the first stage over the tuning range of the receiver without antenna tuning. They resemble jet contrails in that they start out as a white line of 'trail' from an aircraft.
If the receiver seems dead or if only weak signals are heard, try reversing the leads on the six-turn feedback coil. Note that C1 and C2 were 365 pF variable capacitors, but have had a number of plates pulled out with needle nose pliers (see the parts list). I know from my reading that the maximum impedance the antenna will present to the receiver is about 2,000 Ohms.
Unlike contrails, they can be very low and are sometimes tinged with oranges, yellows or purples or even reflect oily rainbows in them (look at this example of rainbow chemtrails).They slowly fan out to a "spider web" hazy cloud cover that spans a large section of sky. The only way I can get away with that in the presence of the ever-present 60 Hz fields is to couple the antenna to the jfet gate with a small capacitance. In this regenerative receiver I have installed ten capacitors ranging from three turns of hookup wire to 100 pF. Let's further say that you have advanced the VERY FINE REGENERATION CONTROL as far clockwise as possible short of oscillation and that you have the signal tuned to the center of its carrier.
You will notice an immediate drop in received signal level, but you can then advance the VERY FINE REGENERATION CONTROL further clockwise, and you will find you have somewhat greater signal strength than you did at 8pF. You will also notice that tuning with the FINE TUNING CONTROL is slightly broader than it was at 8 pF.
You have slightly increased loading of the tuned circuit by the antenna(even though there is a jfet stage between the antenna and the regenerative stage). How far you carry this process depends on the proximity of powerful stations to the station you want to hear.
There is a SPST toggle switch which connects a 33 pF capacitor across the tuned circuit to allow 25 meter band reception. The connections from the 140 pF tuning capacitor and the tuning coil to the RF circuit board below the chassis deck are made with AWG number 14 solid insulated wire.



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