I tested the duty cycle and jitter. I used the configuration of 45-55% duty cycle restriction with lowest jitter. It measured slightly better than the popular configuration of no duty cycle restriction and lowest jitter. Both were way better than an original 8701. The selected configuration is also better for NTSC jumpers since it only needs one. S2 S1 S0 R6 R5 R4 R3 R2 R1 R0 V8 V7 V6 V5 V4 V3 V2 V1 V0 Pin: 5 4 3 2 1 28 27 26 25 24 18 17 16 15 14 13 12 11 10 -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- PAL 0 0 0 0 0 0 0 1 1 1 0 0 0 0 0 1 1 0 0 NTSC 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 1 1 0 0 -Pasi On Sat, Jul 25, 2020, 22:25 Pasi Lassila <pasi.lassila_at_gmail.com> wrote: > neat8701 ready for testing. > https://imgur.com/a/SNjkvSU > > -Pasi > > On Sun, Jul 12, 2020, 07:35 Jim Brain <brain_at_jbrain.com> wrote: > >> On 7/11/2020 9:31 PM, Jeffrey Birt wrote: >> >> Jim, >> >> >> The cost difference between an inverter gate and a transistor + another >> resistor is negligible when building a few of these. If you wanted to build >> a million it would be a different story. I also did not want to go smaller >> than 0603 chip parts so as to not make it impossible for others to >> construct themselves at home. >> >> Yeah, I'd suggest 2 pullups and 1 MOSFET so a limiting resistor was not >> needed, thought I was thinking the latter would be available in through >> hole if space permitted (since you were noting the 0603 size concerns). >> But, if the space is so tight, skipping the resistor is prudent. >> >> Jim >> >>Received on 2020-07-29 10:00:03
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