#Osculator for ceramic resonator full
#Osculator for ceramic resonator code

The crystal is placed in a constant temperature bath, and the temperature in the constant temperature bath is maintained by the constant temperature control circuit to maintain the inflection point temperature of the crystal.

(2) Since the crystal frequency is greatly affected by temperature, in order to ensure the stability of the crystal frequency, it is necessary to pay attention to the crystal constant temperature. When the crystal excitation power is small, the long-term stability is good, but it is preferable to use a low-noise crystal triode. However, excessive crystal excitation power deteriorates the long-term stability (aging characteristics) of the crystal. At this time, the noise introduced by the transistor is not greatly affected. When the excitation power is large, the output power is also large. This is the excitation power of the crystal itself. (1) When applying quartz crystals, there is a practical problem that must be noted.

#Osculator for ceramic resonator code

The inductance L1 is 22 uH (color code inductance), and L2 is 0.3 uH. The capacitors C4 and C8 can be slightly adjusted to change the size of the coupled signal.Ĭapacitor C1 is 20p, C2 is 100p, C3 and C7 are 820p, C4 is 56p, C5 and C8 are 47p, and C6 is 47u/50V.

Inductor L1, capacitor C6, and resistor R3 are improved power supply filter circuits, which function to reduce the ripple voltage to oscillate the DC component. C3 and C7 are AC bypass capacitors so that the emitter of VT1 is at AC zero potential, but the DC potential is not zero. L2 is a high-frequency choke coil that provides a DC path to the collector current of the oscillating tube VT1. Among them, the resistors RI, R2 and the resistors R5, R6, and R7 are DC biasing elements of the transistors VT1 and VT2. The pole tube TV2 performs signal amplification and is coupled out through the capacitor C8. The crystal SJT is connected between the input and output terminals of A1 to provide a feedback loop that produces oscillations at the fundamental frequency of the crystal. Tuning capacitors C1 and C2 allows the frequency to be accurately tuned to the center frequency. After A2 is divided by two, the 128kHz oscillation signal is obtained. The switch is placed at 3 points and sent to A3. After A2 is divided by two, the 2048kHz oscillation signal is obtained. Set the switch to 1 point and send it to A2. In the figure, A1 and the crystal resonator SJT and the capacitor constitute a square wave signal of 4069 kHz. The crystal SJT is connected between the input and output terminals of A1 to provide a feedback loop at the fundamental frequency of the crystal. Tuning capacitors C1 and C2 allow the frequency to be accurately tuned to the center frequency.

Introduce ten kinds of crystal oscillator circuit diagrams.Īs shown in the figure, it is a simple crystal oscillator circuit composed of three gates of A1, four resistors, tuning capacitors and a crystal. Ⅹ Crystal Oscillator Circuit Diagram (10)

#Osculator for ceramic resonator full

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