sheet3
... minimum value of the feedback resistor and frequency of oscillation with Ri=15 kΩ, L1 = 10 μH, L2 = 270 μH, and C = 0.001μf? 6. A Hartley oscillator has Ri= 10 kΩ, C = 0.015 μf, L1 = 15 μH. Determine the value of L2 if the frequency of oscillation is to be 100 kHz. 7. Determine the operating frequen ...
... minimum value of the feedback resistor and frequency of oscillation with Ri=15 kΩ, L1 = 10 μH, L2 = 270 μH, and C = 0.001μf? 6. A Hartley oscillator has Ri= 10 kΩ, C = 0.015 μf, L1 = 15 μH. Determine the value of L2 if the frequency of oscillation is to be 100 kHz. 7. Determine the operating frequen ...
Short Wave receiver
... available for frequency measurements. I have thought of a digital frequency presentation but decided not to do so because of the lack of space available inside the box and the additional heat radiation that comes with it. However, an analogue readout has been incorporated ( old junkbox meter with ca ...
... available for frequency measurements. I have thought of a digital frequency presentation but decided not to do so because of the lack of space available inside the box and the additional heat radiation that comes with it. However, an analogue readout has been incorporated ( old junkbox meter with ca ...
Powerful AM transmitter Click here for the circuit diagram
... The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here. Resonators/filters of other frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may also be used. Use of different frequency filters/resonators will involve corresponding variation in the value of in ...
... The circuit for a powerful AM transmitter using ceramic resonator/filter of 3.587 MHz is presented here. Resonators/filters of other frequencies such as 5.5 MHz, 7 MHz and 10.7 MHz may also be used. Use of different frequency filters/resonators will involve corresponding variation in the value of in ...
Chapter 7 - Portal UniMAP
... • Mixers generate signals that are the sum and difference of the incoming signal frequency (fS) and the frequency of the local oscillator (fLO). • The difference frequency is more commonly chosen as the IF. • Some receivers use the sum frequency for the IF. ...
... • Mixers generate signals that are the sum and difference of the incoming signal frequency (fS) and the frequency of the local oscillator (fLO). • The difference frequency is more commonly chosen as the IF. • Some receivers use the sum frequency for the IF. ...
GARC Regenerative radio night.
... transmitter. It can obviously be considered as a load and we say it “Loads our tuned circuit”. In the same way, whatever is coupled to the circuit in the way of a detector or amplifier also takes energy out of the system. Anything that loads or removes energ ...
... transmitter. It can obviously be considered as a load and we say it “Loads our tuned circuit”. In the same way, whatever is coupled to the circuit in the way of a detector or amplifier also takes energy out of the system. Anything that loads or removes energ ...
- Krest Technology
... A high-performance ultrahigh-frequency amplitude shift keying (ASK) detector for lowpower radio-frequency (RF) receivers is proposed. The circuit is based on a high-gain common-source topology with a feedback loop that provides adaptive biasing. Hence, high sensitivity and rail-to-rail input operati ...
... A high-performance ultrahigh-frequency amplitude shift keying (ASK) detector for lowpower radio-frequency (RF) receivers is proposed. The circuit is based on a high-gain common-source topology with a feedback loop that provides adaptive biasing. Hence, high sensitivity and rail-to-rail input operati ...
A 1920s Style Colpitts Broadcast Receiver
... connected to the set through an external 10 pF coupling capacitor, and no ground connection, the tuning range is 530–1010 kHz with the full inductance of L1 switched in, and 1007–1743 kHz with the tap on L1 switched in. Actual frequency coverage varies depending on antenna length and coupling capaci ...
... connected to the set through an external 10 pF coupling capacitor, and no ground connection, the tuning range is 530–1010 kHz with the full inductance of L1 switched in, and 1007–1743 kHz with the tap on L1 switched in. Actual frequency coverage varies depending on antenna length and coupling capaci ...
WIRELESS HEADPHONES USING INFRARED RAYS
... Both the transmitter and receiver circuit are built around IC LM386,powered by a 9V battery. ...
... Both the transmitter and receiver circuit are built around IC LM386,powered by a 9V battery. ...
The regenerative circuit
... mid-1930s) had a non-regenerative voltage gain of only 9.2 at 7.2 MHz, but in a regenerative detector, had voltage gain as high as 7900. In general, "... regenerative amplification as found to be nearly directly proportional to the non-regenerative detection gain." "... the regenerative amplificati ...
... mid-1930s) had a non-regenerative voltage gain of only 9.2 at 7.2 MHz, but in a regenerative detector, had voltage gain as high as 7900. In general, "... regenerative amplification as found to be nearly directly proportional to the non-regenerative detection gain." "... the regenerative amplificati ...
Regenerative circuit
The regenerative circuit (or regen) allows an electronic signal to be amplified many times by the same active device. It consists of an amplifying vacuum tube or transistor with its output connected to its input through a feedback loop, providing positive feedback. This circuit was widely used in radio receivers, called regenerative receivers, between 1915 and World War II. The regenerative receiver was invented in 1912 and patented in 1914 by American electrical engineer Edwin Armstrong when he was an undergraduate at Columbia University. Due partly to its tendency to radiate interference, by the 1930s the regenerative receiver was superseded by other receiver designs, the TRF and superheterodyne receivers and became obsolete, but regeneration (now called positive feedback) is widely used in other areas of electronics, such as in oscillators and active filters. A receiver circuit that used regeneration in a more complicated way to achieve even higher amplification, the superregenerative receiver, was invented by Armstrong in 1922. It was never widely used in general receivers, but due to its small parts count is used in a few specialized low data rate applications, such as garage door openers, wireless networking devices, walkie-talkies and toys.