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Index 22

Double Tuned Band-pass Filter

Published:2012/12/27 0:59:00 Author:muriel | Keyword: Double , Tuned , Band-pass Filter

Double Tuned Band-pass Filter
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K7LR Memorial Receiver

Published:2012/12/27 0:58:00 Author:muriel | Keyword: K7LR , Memorial Receiver

K7LR Memorial Receiver
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D Flip-Flop 2

Published:2012/12/27 0:56:00 Author:muriel | Keyword: D Flip-Flop

D Flip-Flop 2
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D Flip-Flop

Published:2012/12/27 0:56:00 Author:muriel | Keyword: D Flip-Flop

D Flip-Flop
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Fine Control SuperBright LED Pulser

Published:2012/12/23 21:01:00 Author:muriel | Keyword: Fine Control, SuperBright LED Pulser

Fine Control SuperBright LED Pulser
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Pulse-Generator & Signal-Tracer

Published:2012/12/21 21:44:00 Author:muriel | Keyword: Pulse-Generator, Signal-Tracer

Pulse-Generator & Signal-Tracer
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8 ~ 12MHz voltage controlled oscillator circuit diagram with stable output amplitude

Published:2012/12/21 1:44:00 Author:Ecco | Keyword: 8 ~ 12MHz , voltage controlled oscillator , stable output amplitude

8 ~ 12MHz voltage controlled oscillator circuit diagram with stable output amplitude
In the circuit, VT2 controls the collector current of VT1, therefore, the oscillation amplitude of VT1 is very stable. VT4 output signal is converted into a DC signal by VD2 detector, here is the automatic gain controlling state, so that the DC voltage is kept constant. RP1's midpoint voltage is - 0.6V, and the current holding in R1 and R2 is equal, thereby controlling the output amplitude constant value. Oscillation frequency is decided by L1, C2, varactor diode VD1 and distributed capacitor. Uo output voltage is 2V, the frequency is 8 ~ 12MHz signal. (View)

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Low distortion Wien bridge oscillator circuit diagram

Published:2012/12/21 3:08:00 Author:Ecco | Keyword: Low distortion , Wien bridge, oscillator

Low distortion Wien bridge oscillator circuit diagram
The oscillation principle is that when the loop phase shift amount is an integer multiple of 0 ° or 360 °, the loop gain is greater than 1, the circuit starts oscillation. If the oscillation is increased, the circuit will be saturated, therefore it needs an amplitude stabilization circuit. In the circuit, the amplitude stabilization circuit uses a junction FET (VT1) drain - source resistor to connect with R1 in series to make R2 / 2 = 4.7kΩ / 2 = 2.35kΩ. (View)

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Simple Square wave Generator

Published:2012/12/20 20:57:00 Author:muriel | Keyword: Simple , Square wave, Generator

Simple Square wave Generator
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Low-distortion Audio-range Oscillator

Published:2012/12/20 20:57:00 Author:muriel | Keyword: Low-distortion , Audio-range , Oscillator

Low-distortion Audio-range Oscillator
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Portable Mixer

Published:2012/12/19 21:43:00 Author:muriel | Keyword: Portable Mixer

Portable Mixer
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Exclusive-OR gates with split output 2

Published:2012/12/17 20:35:00 Author:muriel | Keyword: Exclusive-OR gates , split output

Exclusive-OR gates with split output 2
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Exclusive-OR gates with split output

Published:2012/12/17 20:35:00 Author:muriel | Keyword: Exclusive-OR gates , split output

Exclusive-OR gates with split output
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symmetrical AC waveform

Published:2012/12/17 20:33:00 Author:muriel | Keyword: symmetrical AC waveform

symmetrical AC waveform
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JFET switch (B) output waveform

Published:2012/12/17 20:32:00 Author:muriel | Keyword: JFET switch (B), output waveform

JFET switch (B) output waveform
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Shaping a Sine Wave Into a Square Wave

Published:2012/12/17 20:32:00 Author:muriel | Keyword: Sine Wave, Square Wave

Shaping a Sine Wave Into a Square Wave
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Base VFO

Published:2012/12/17 20:31:00 Author:muriel | Keyword: Base VFO

Base VFO
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Scanning oscillator circuit diagram

Published:2012/12/17 3:42:00 Author:Ecco | Keyword: Scanning oscillator

Scanning oscillator circuit diagram
This circuit is composed of RC Wien bridge oscillator and voltage controlled resistor, wherein the Wien bridge circuit is available for RC circuit with a selected frequency, and A1 magnification is about three times, loop gain is 1. The output of A2 is half wave rectified by VD2, then it is comparing with the reference current generated by VD4 to make integrating, thereby controlling the VT1's gate voltage and changing the resistance between the drain - source. (View)