Archive for tag: Tone Decoder

Powerline Carrier-Current Remote Control or Intercom

Uncategorized | By: Diagram mania

Using 567 IC tone decoder/detector, we can build a remote control and or intercom. This circuit can be used to control a relay, or to carry an audio signal (intercom) through power-line wiring. Here is the schematic diagram of this remote control/intercom circuit: The relay will be activated if you inject a 100kHz tone. This […]

LM 567 IC Touch-Tone Decoder

Uncategorized | By: Diagram mania

This touch tone decoder can be used to decode a DTMF (Dual Tone Multiple Frequency) signal from a telephone device or from other generator. Using the frequency values shown in the schematic diagram, this circuit decodes a standard touch tone codes. The components R1 and C1 for each 567 chip should be computed according to […]

Dual-Tone (Frequency) Decoder (Detector)

Sensor Circuit | By: Diagram mania

The output of this circuit will be activated when a mix of two tone/frequency is detected on the input. The frequency f is determined by the values of R1 and C1, where f=1/(1.1 * R1 * C1). For security, using dual tone is more secure compared with using only single frequency. With single frequency, someone […]