04-10-2017, 09:23 PM
Hi.
One thing I tried was using a 555 in the frame stage instead of using the original frame blocking oscillator. I have to say it works very well indeed. In fact it's a straightforward mod. Considerably cheaper than getting the original transformer rewound, not authentic mind you. I was feeding it from a 1881 sync separator chip. Solid lock on both 25 & 50 Hz frame rates.
One thing I tried was using a 555 in the frame stage instead of using the original frame blocking oscillator. I have to say it works very well indeed. In fact it's a straightforward mod. Considerably cheaper than getting the original transformer rewound, not authentic mind you. I was feeding it from a 1881 sync separator chip. Solid lock on both 25 & 50 Hz frame rates.
