This circuit from a 1967 documentation generates 2.5 Hz signals depending on the capacitors used, in this case 160 uF. For 4 6700 pF the signal will be 20 kHz.
This divider by 6 is synchronized because it is implemented based on TTL or CMOS logic according to the...
Found in Popular Electronics from the 90's, this tuned to infrared modulated receiver uses a PLL....
This circuit allows you to program a resistance by combining the selected resistors. The circuit...