Harmonics
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Frequency warning alarm
A low-frequency oscillator (Q1) modulates a high-frequency oscillator (Q2) along with its associated timing capacitor. The output frequency varies continuously.
The circuit comprises two primary components: the low-frequency oscillator (Q1) and the high-frequency oscillator (Q2). The low-frequency oscillator is responsible for...
Twin-T RC Notch Filter
The two T-notch filter can be utilized to block unwanted frequencies or, when incorporated into an operational amplifier, function as a bandpass filter. The notch frequency occurs when the capacitive reactance equals the resistance (Xc = R), and if these...
Variable Q Filter For 400Hz Circuit
A bootstrapped twin notch filter in this circuit can yield an effective Q of up to 10. Rs adjusts the feedback, hence the Q. Values of C1 and C2 can be changed to alter the frequency. RF is a fine-tune...
Oscillator circuits
For successful circuit-building exercises, follow these steps: Measure and record all component values before constructing the circuit, selecting resistor values that are sufficiently high to minimize the risk of damaging any active components. In case of significant errors (greater than...
Electronic filter
An electronic filter is utilized to enhance the filtering effect of capacitor C5. Capacitors in this configuration form a composite circuit with the electronic filter, as illustrated in the accompanying figure. The advantage of using smaller capacitors (5 to 20...
Rectangular/Triangular Waveform Converter
Many function generators utilize a rectangular waveform generator that comprises a Schmitt trigger and an integrator. The triangular signal generated by the integrator is subsequently transformed into a sinusoidal signal using a diode network. The converter described here operates inversely,...
Antialiasing And Sync-Compensation Filter
Two dual-biquad filter chips and some external components form a multipurpose filter to reconstruct D/A converter signals. Connected to a converter's output, the filter provides antialiasing, reduces the D/A converter's quantization noise, and compensates for the "sync" function (attenuation). The...
ROTARY SWITCH DEBOUNCE
A three-stage active Butterworth bandpass input filter is utilized in a radioteletype demodulator to differentiate RTTY tones from one another and from noise. The filter is centered at 2200 Hz and has a bandwidth of approximately 260 Hz, allowing for...
RC Low-Pass passive Filter
What is the purpose of this circuit? Basically it has two roles: to pass the desired low frequency signals and stop the unwanted high frequency signals. Open the netlist file lpfilter1.cir with your SPICE simulator. Most simulators display the netlist...