UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Mixed sync (and blanking) from separate H/V sync

ppppenguin · 7th Sep 2010, 2:40 pm

Didn't know you were using a rock for the oscillator. PSD1 in a 4046 is just an XOR gate. It's the digital version of an analogue multiplier such as the 1496. pull-in range is limited. PSD2 is a clever sequential device with infinite pull-in range but both signals that feed it must be continuous and have no missing edges.

7th Sep 2010, 2:40 pm	#14
ppppenguin Retired Dormant Member Join Date: Dec 2003 Location: North London, UK. Posts: 6,168	Re: Mixed sync (and blanking) from separate H/V sync Didn't know you were using a rock for the oscillator. PSD1 in a 4046 is just an XOR gate. It's the digital version of an analogue multiplier such as the 1496. pull-in range is limited. PSD2 is a clever sequential device with infinite pull-in range but both signals that feed it must be continuous and have no missing edges.