2016年4月25日 · 计划一个晶体管IC+电子管的接收机很长时间了，今天阶段性的试验完成了接收机的本振部分，电路由arduino+ad9850构成基准频率源驱动VCO（NE612）构成PLL系统，PLL本振输出10V ...

The circuit starts with a NE612 mixer IC (IC1), which also contains an oscillator. The oscilla-tor is a Colpitts type and is tuned here using a dual-varicap diode (D1). The Mixer is fol-lowed by a crystal filter which has a centre frequency of 45 MHz and a bandwidth of 15 kHz.

2022年11月28日 · MC13135内含二次变频电路(包括mc3362)，相当于两片ne612,且性能要比ne612要好,主要增益高噪音小，电路也简单容易制作。 另外mc13135与mc3362价格非常便宜一个3元一个1.2元。

The signal of the VCO in the 4046 is buffered by feeding it into the internal phase detector. At pin 2 it exits the 4046 and is fed into a resistive divider to give a signal of about 260 mV amplitude, suitable for input into the NE612 mixer.

两路ne612相乘解调出来的信号，先经过c712/c706隔离直流分量，r717/r710是直流分量泄放通路，以免引起音频失真。 再各自经过两级RC低通滤波器，滤除乘法器输出的高频频率分量。

The transmitter consists of a TX mixer (NE612) and a bandpass filter on 70 MHz. In the mixer the VCO signal is mixed with the SSB from the exiter in mode USB/LSB, and with a simple crystal oscillator at 10.7 MHz for FM and CW.

VFO is mixed with 4.0 Mhz. to get the desired 7.0 Mhz signal. The term "heterodyne" refers to the mixing function, where two different frequencies are combined in a non-linear way to generate an output waveform of a different frequency.

"The SA612A is a low-power VHF monolithic double-balanced mixer with on-board oscillator and voltage regulator. It is intended for low cost, low-power communication systems with signal frequencies to 500 MHz and local oscillator frequencies as high as 200 MHz.

Description: Double-balanced mixer and oscillator. 5 Results. Part #: NE612A. Datasheet: 163Kb/8P. Manufacturer: NXP Semiconductors.

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