SL624C Multimode Detector

SL624 Plessey


  • Demodulates FM, AM, SSB and CW
  • Operates up to 30 MHz (Typ)
  • Voltage-Controlled Audio Gain
  • Separate Audio Driver


  • Mobile Transceivers
  • HF Transceivers
  • VHF Transceivers

Operating Notes

Figs. 3, 4 and 5 show the SL624C used, respectively, as a synchronous AM detector, a quadrature FM detector and a self-oscillating product detector. It is evident that a multi mode receiver may be made either by switching the components around one SL624C with relays or diodes, or by using three SL624Cs, one per mode.
The supply to the SL624C should be decoupled at HF by a 0.1 µF capacitor sited as near as possible to pins 2 and 5.

Fig. 3

SL624 Fig. 3

Fig. 4

SL624 Fig. 4

Fig. 5

SL624 Fig. 5