Tone-alert decoder

  
PLL (Ul) is set with R2 to desired tone frequency. LED lights to indicate lock-up of PLL. Reduce signal level (Rl) and readjust R2 to assure lock-up. Delay is selected from counter U3 output. Circuits latches (turns on Q1 to allow audio to speaker) when proper frequency/duration signal is received
Tone-alert decoder - schematic

To reset latch, a positive voltage must be applied briefly to the R input of U4.




Leave Comment

characters left:

New Circuits

.