Oscillator Circuits
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Many function generators are based on a rectangular waveform generator that consists of a Schmitt..
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Although ceramic resonators are a good choice for low-power, low-frequency clock sources (if you can stand their 30-ppm te..
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CI capacitor in series with the crystal may be used to adjust the output frequency of the oscillator. The valu..
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This simple circuit will oscillate with a wide range of crystals. Connect several different types of crystal holders in ..
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Using an EXAR XR2206, this generator will produce sine, square, and triangular waves from 10 Hz to 100 kHz. Ul is ..
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Using an Intersil ICL8038, this function generator generates frequencies from 1 Hz to over 80 kHz. Rl is the fine freque..
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Laser-receiver circuits must bias their avalanche photo diodes (APD) to achieve optimal gain. Unfortunately, an APD..
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This circuit uses a comparator as a Schmitt trigger (311H) and two active bandpass filters (LM318H). 3-kHz output ..
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Ql is a fixed oscillator operating at 455 kHz. Ul is a mixer, with its own internal oscillator running at 45..
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This VFO circuit covers from 2.13 to 2.58 MHz and is intended for use with an external mixer to heterodyne the signal to desired..
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The circuit"s frequency oscillation is /=2.8/ [Cix(/i + i2)]· Using the values shown, the output frequency can be varie..
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By connecting this circuit to a logic device that"s under power, you can get an indication as to its status. If the circuit is ..
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Seven-V narrow pulses from 2 Hz to 50 kHz are produced by this circuit. CI through C4 provide frequency ranges i..
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A simple pulse stretcher built with two sections of an op amp uses voltage follower U1A to drive Dl and C2. ..
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This simple and symmetrical free-running generator has a 50- output impedance, a pulse width of 100 ns..
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This straightforward circuit uses an NE555 timer as an oscillator, a 7493 counter chain and a DAC0806 D/A conver..
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Cascading two identical integrators will thus result in an overall phase shift of 180° and an amplification of unity (p..
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This circuit produces a pure, - 80-dB THD sine wave with a frequency that is equal to the fc of IC3"s filter. A TT..
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This compact LC oscillator offers a frequency range of about 1 kHz to almost 9 MHz and a low-distortion sine-wave ou..
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This oscillator uses two transistors and operates the crystal in the fundamental mode. CT and C2 should..
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This phase-shift oscillator is useful for audio oscillator applications. Adjust R7 for a good sine w..
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Using a Quad NAND Gate, the TTL oscillator can use fundamental crystals between 1 and 10 MHz. The sine..
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The NE555 is connected in the astable mode and uses only three timing components (RA, RB, and Ct. A 0.01-/aF bypass ..
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This circuit will generate a square wave of 2 Hz to 20 kHz. The circuit uses an op amp in a relaxation-oscil..
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When this circuit is turned on, the natural offset of the devices serves as an automatic starting voltage. Assume that ..
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When the output is high, R3 and R4 are in parallel, and CI charges via Rl until the current in R2 equals that a..
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This circuit adds 120 degrees of phase shift to a 50- or 60-Hz input, regardless of the frequency and amplitude fluctuations ..
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Adding a simple clamping circuit to a Harris 2620 high-speed op amp produces a glitch-free amplifier/ clipper. The op a..
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This circuit takes audio from a receiver that might have a weak CW or tone signal and uses a PLL (Ul) to recover the wea..
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This circuit can extract harmonics from various waveforms. With a sloped input waveform, the comparator produces a pulse..
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Using two CA3450 op amps and a CA3227 transistor array, this circuit will accurately full-wave rectify sign..
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This circuit combines the characteristics of an asynchronous S/R flip-flop and an edge-triggered JK flip-flop. It changes sta..