Oscillator Circuit

145MHz variable crystal oscillator with 200mW output

Published:2011/11/7 19:02:00 Author:Ecco | Keyword: 145MHz, variable, crystal oscillator, 200mW output

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Accurate variable frequency oscillator

Published:2011/11/7 19:01:00 Author:Ecco | Keyword: Accurate , variable frequency oscillator

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Continuously variable voltage -frequency Wien audio bridge oscillator circuit

Published:2011/11/11 2:40:00 Author:Ecco | Keyword: Continuously , variable, voltage -frequency , Wien , audio, bridge , oscillator

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Inductance feedback oscillator circuit

Published:2011/11/11 2:42:00 Author:Ecco | Keyword: Inductance feedback oscillator

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Capacitive feedback oscillator circuit

Published:2011/11/11 2:42:00 Author:Ecco | Keyword: Capacitive feedback oscillator

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Digital oscillator controlled by potentiometer

Published:2011/11/11 2:41:00 Author:Ecco | Keyword: Digital oscillator, potentiometer

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Single-tube transformer oscillator circuit

Published:2011/11/11 2:35:00 Author:Ecco | Keyword: Single-tube, transformer , oscillator

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Low-offset crystal oscillator

Published:2011/11/11 2:39:00 Author:Ecco | Keyword: Low-offset , crystal oscillator

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Low-noise FET crystal oscillator

Published:2011/11/11 2:33:00 Author:Ecco | Keyword: Low-noise, FET, crystal oscillator

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Low-noise 5MHz oscillator

Published:2011/11/11 2:34:00 Author:Ecco | Keyword: Low-noise, 5MHz , oscillator

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Single-tube RF oscillator

Published:2011/11/11 2:37:00 Author:Ecco | Keyword: Single-tube, RF oscillator

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Single-tube quartz crystal oscillator

Published:2011/11/11 2:29:00 Author:Ecco | Keyword: Single-tube, quartz crystal oscillator

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Magnetic pendulum oscillation circuit

Published:2011/11/11 2:30:00 Author:Ecco | Keyword: Magnetic pendulum oscillation

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Dual-frequency crystal oscillator

Published:2011/11/3 3:40:00 Author:Ecco | Keyword: Dual-frequency , crystal oscillator

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Colpitts oscillator with adjustable frequency

Published:2011/10/24 21:18:00 Author:Ecco | Keyword: Colpitts oscillator , adjustable frequency

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RC bridge oscillating circuit with regulating ring

Published:2011/8/19 2:28:00 Author:Jessie | Keyword: RC bridge oscillating, regulating ring

Connectingregulating ring to circuit, and adjusting potentiometer Rp, then you can use an oscilloscope to observe the output wave of oscillator circuit and the change of oscillating circuit's output wave, we will realize the influence of stability of regulating ring to sinusoidal oscillator circuit performance.   (View)

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Indirect self-excited feedback astable multivibrator circuit composed of 555

Published:2011/8/23 21:10:00 Author:Ecco | Keyword: Indirect self-excited feedback , astable multivibrator , 555

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The 74 series digital circuit of 74123 74L123 double monostable multivibrator

Published:2011/9/18 21:07:00 Author:Ecco | Keyword: The 74 series, digital circuit, double monostable multivibrator

Capacitance. To improve the precision and repeatability of the pulse width, it could connect a resistance between REXT/CEXT and VCC, and open for RINT. In order to get the variable pulse width, it could connect a variable resistance between RINT and VCC. 74123, 74L123, 74LS123, 74HC123 double monostable multivibrator   (View)

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The 74 series digital circuit of 74121 74L121 monostable multivibrator

Published:2011/9/18 21:06:00 Author:Ecco | Keyword: 74 series, digital circuit, monostable multivibrator

To improve the precision and repeatability of the pulse width, it could connect a resistance between REXT/CEXT and VCC, and open for RINT. To improve pulse width, it could connect atiming resistance betweenREXT/CEXT and CEXT.   (View)

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The Colpitts oscillator

Published:2011/9/18 20:55:00 Author:Ecco | Keyword: colpitts , oscillator

Figure shows the Colpitts oscillator circuit. It has a base frequency crystal, and the frequency is 1499 kHz, crystal SJT is connected to the both ends of capacitor C2, C3. Emitter divider resistor R2, R3 provide basic feedback signal, the feedback voltage is controlled by the capacitive dividers C2, C3. SJT crystal provides l499kHz sine wave signal for the base of the transistor VT after working. And it is output by VT emitter output VT. Resistors R1 provides a 18V step-down voltage for a proper bias voltage of VT, appropriately adjusting resistor R1 could make Colpitts oscillator work in the soft excitation state. Resistor R4, capacitor C5 is post-coupling circuit. Regulating capacitor C1 can fine-tune the oscillator working frequency. Adjusting potentiometer RP can change the oscillation signal output level. Selecting components: capacitors Cl, 5 ~ 20p, C2 to 51p, C3, C6 to 100p, C4 to 15p, C5 is 100μ/32V. Resistor Rl is 62kΩ, R2 is 300Ω, R3 is 2.4kΩ, R4 is 360Ω, 1/2W, R5 is 15kΩ. Potentiometer RP is 4.7kΩ. Transistor VT is 3DGl20C, 65 ≤ β ≤ 115. Zener diode VD uses 2CW58. crystal SJT uses JA5B-1499Hz.   (View)

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