Making sounds with analogue electronics Subtractive synthesis
#analogue electronics
#subtractive synthesis
#sound generation
#audio synthesis
#oscillator
#filter
#modulation
#waveform
#electronic music
#signal processing
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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...
nescaf
The NEScaf filter is designed to offer greater flexibility than previous filters for QRP (low-power) radio rigs. It features two panel-mounted controls: a single center-detent potentiometer that adjusts the center frequency of the filter's bandpass (settable between approximately 415 Hz...
Local Oscillator For Double Balanced Mixers Circuit
This circuit includes an amplifier designed to deliver +10 dBm to an SBL series (Mini-Circuits) or a similar type of doubly-balanced mixer assembly. The circuit parameters are specified for 80 to 90 MHz crystals, although the values of the oscillator...
Wide frequency oscillator
An oscillator/amplifier is resistively tunable over a wide frequency range. Feedback circuits containing operational amplifiers, resistors, and capacitors synthesize the electrical effects of inductance and capacitance in parallel between the input terminals. The synthetic inductance and capacitance, and therefore the...
The Ecology of the Oscillator Transmitter
An oscillator-only transmitter appears to be the simplest way to access the radio airwaves; however, it presents several challenges as part of a transmitting and receiving station. The issue of finding an adequate crystal-controlled transmitter for newcomers wishing to operate...
Variable Duty-Cycle Oscillator Circuit
A 1.2-kHz oscillator utilizing a potentiometer and steering diodes allows for a duty cycle adjustment ranging from 1% to 99%. The frequency can be altered by varying the capacitor CI. It is important to note that the diodes may slightly...
Rejection filter
This narrowband filter utilizing the 741 operational amplifier can achieve a rejection level of up to 60 dB. By employing resistors with a value of 100 K ohms and capacitors of 320 pF, the circuit effectively rejects frequencies at 50...
Metal detector circuit diagram 5
The metal detector circuit comprises an oscillator and a sound-light alarm circuit. The oscillator circuit includes an inductor (L), a capacitor (C1), a sensor switch integrated circuit (IC1) that integrates the oscillator, detector, comparator circuit, and peripheral components. The sound-light...
wonky wire
The Wonky Wire circuit is based on the same oscillator used for the Flashing LED Lights. The timing components (R1/C1 and R4/C2) are significantly smaller, resulting in a higher oscillation frequency of approximately 3 kHz (3000 cycles per second). A...