βMC1309

The βMC1309 is a phase locked loop stereo decoder integrated circuit made by IPRS Băneasa [1].

The I.P.R.S. Băneasa Full Line Condensed Catalog (1990) lists the βMC1309A and βMC1309, marked as preliminary data, as monolithic integrated circuits made with IIL and linear bipolar technology, which work as a stereo signal demodulator-decoder; the internal functions include automatic mono-stereo switching and the drive for an external lamp that shows the stereo mode; the decoder needs few external components and no external coils, and its only adjustment is a potentiometer that sets the oscillator frequency [1].

The catalog gives an operating temperature printed as „−25 … 170 °C”, a storage temperature of −25…+125 °C, a supply voltage of 4.5…16 V (βMC1309A) and 6.0…16 V (βMC1309), a channel balance of at most 1 dB, a typical monaural gain of 0.9 dB, a typical channel separation of 40 dB and a capture range of at least ±7 % [1]. Pins (TO-116, top view): 1 V+, 2 input, 3 amplifier output, 4 left channel output, 5 right channel output, 6 lamp indicator, 7 GND, 8 switch filter, 9 switch filter, 10 19 kHz output, 11 phase & amplitude detector input, 12 loop filter, 13 loop filter, 14 oscillator RC network [1]. The typical application and test circuit (in the Gallery) uses C1 = 2 µF, C2 = C3 = 22 nF, C4 = 0.22 µF, C5 = 47 nF, C6 = 0.47 µF, C7 = 470 pF, C8 = 0.22 µF, R1 = R2 = 3.3 kΩ, R3 = 1 kΩ, R4 = 16 kΩ and R5 = 5 kΩ [1].