455 Khz Ceramic Resonator Oscillator

This 455 khz ceramic resonator provides a reference frequency for the colpitts oscillator.

455 khz ceramic resonator oscillator. The design is a 5 resonator gaussian with 500 hz bandwidth. I was looking for a way to give complete isolation between tester and radio. A gaussian to 6 db design is a little better i think. The non 455 khz centre frequency is produced by the data sheet motional parameters which are clearly not precise.

Marc suggested using an if transformer on the output. This made a 455 ceramic resonator oscillator and audio oscillator. Nand gate u2a is the modulator and provides a 100 square wave modulated signal. 20 50 100 300 1 khz 3 khz 10 khz 20 khz frequency hz sound pressure level db f i g u r e 3 7 a comparison of the ear s response at 20 hz compared to that at 1 000 hz.

A typical ceramic resonator has three terminals. Figure 1 4 equivalent circuit for a ceramic resonator in the frequency range of fr f fa figure 1 6 spurious characteristics for a typical ceramic resonator 455 khz figure 1 5 impedance and phase characteristics for figure 1 7 basic configuration for an lc oscillation circuit ceramic resonators. 455 khz oscillator circuit 3 used transistor bc548 9 volt supply voltage rf signal is produced with 455 khz ceramic crystal the objectives of if alignment are to ensure that all tuned circuits in the if stages are tuned to the same frequency. Ca01 magazine ex csb 455 e q w e 1 r t.

Simplest 455 khz oscillator uses only three parts negative resistance ceramic filter oscillator ceramic resonator oscillator rf oscillator with three parts the simplest oscillator ever if anyone can successfully disprove this claim i ll gladly retract it. Unit operates off a 9 volt battery. To receive a 1 500 khz signal the local oscillator is tuned to 1 955 khz and the resulting difference is still 455 khz. Inverters u1d e along with ceramic resonator x1 form a stable 0 5 455 khz oscillator.

In use you will find there isn t much difference between 455 and 465 khz. Almost no effect on dial calibration. Ceramic resonator inexpen sive small not required 0 5 excellent qseries csb. Electronics projects 455 khz oscillator circuit analog circuits projects date 2019 08 02.

This ceramic resonator is tuned or cut to resonate at around 455 khz and will serve a sub band like 550 to 1 600 khz as in a typical amplitude modulation am band. Nand gate u2b buffers the original unmodulated signal and its propagation delay ensures that its output is in phase with the output of u2a. 12db in this case. Low q gives loss.

The ceramic resonator is a fairly common part often used in remote controls. 00hr ceramic resonator 12mhz smd shipsamedays88. This is then fed through a third bjt where the 455khz is mixed in from a ceramic resonator.