TREE

This is a simple design, can have excellent results, he is a recipient of regeneration, if you have never built any receiver, this is one you will build Easy. The circuit described is simple and has many limitations in sensitivity and selectivity, but is able to receive signals from radio amateurs (40m or 80m) in SSB and CW, and as output using a small headset crystal.  He will have a saturation if there are strong stations available on AM broadcast band of 41m at night.L1 is a small toroid T50-2 (red) with about 18 to 20 times (40m) or 35 to 40 times (80m) in the main winding connected to the FET with a single coupling circuit facing the antenna connection.  The center tap is about 20% of the primary winding. C1 is adjusted to set the radio band to the 40m and C2 then acts as a fine tuning within the band.The supply of 12 to 14V, R2 should be increased 5K6 or 6K8 output will be higher and similar sensitivity to-100dBm (about 2uV). Regenerative Receiver Circuit Diagram

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Let’s examine the following TTL circuit and analyze its operation: Transistors Q 1 and Q 2 are both arranged in the same manner that we’ve seen for transistor Q 1 in all the other TTL circuits. Rather than functioning as amplifiers, Q 1 and Q 2 are both being used as two-diode “steering” networks. We may replace Q 1 and Q 2 with diode sets to help illustrate: If input A is left floating (or connected to V cc ), current will go through the base of transistor Q 3 , saturating it. If input A is grounded, that current is diverted away from Q 3 ‘s base through the left steering diode of “Q 1 ,” thus forcing Q 3 into cutoff. The same can be said for input B and transistor Q 4 : the logic level of input B determines Q 4 ‘s conduction: either saturated or cutoff. Notice how transistors Q 3 and Q 4 are paralleled at their collector and emitter terminals. In essence, these two transistors are acting as paralleled switches, allowing current through resistors R 3 and R 4 accord...