On 09/06/2017 03:19 PM, Mia Magnusson wrote: > > Also I found some stuff on the net about improving the picture by > changing stuff in the RF modulator. Maybe that might be an option too. > Although the picture is sharp enough to not give any readability > problems at all it would be nice to have a picture as sharp as > possible (without overshoots). :) I found this circuit to give a nice, sharp picture on my 1084 CRT: Video amp for TED or VIC-II. To be used in place of the RF modulator, generating better signal quality. Note: This circuit removes the CVBS output! It's Y/C only! ___ R1 chroma in -----|___|---+ +5V | | | | R2 | | ___ | |/ +----|___|---*----| T1 | |\ | R4 R3 V | ___ ___ | *--|___|--*--|___|--+ | | | | || C1 --- +--------||---------- chroma out GND || D1 R5 +5V ___ | luma in ---|<|--*--|___|--*-------------------+ | | | | | | | |/ === C2 +-------| T2 | |\ | V | | R6 R7 | | ___ ___ | +--|___|--*--|___|--* | | | --- | GND | +--------- luma out T1 = T2 = BC547B D1 = 1N4148 R1 = R2 = 510 Ohm R3 = 68 Ohm R4 = 270 Oh R5 = 470 Ohm (if 6569, use 1 KOhm for TED and 8565) R6 = R7 = 150 Ohm C1 = 1nF C2 = 100nF Do _not_ use metal film resistors, keep connections short. luma in = pin 23 on TED, pin 15 on VIC-II chroma in = pin 13 on TED, pin 14 on VIC-II luma out = pin 1 on video output chroma out = pin 6 on video output Use a clean +5V supply, not the C64 main supply. A 78L05 will work. Might still need 330 Ohm series resistor for Chroma. Gerrit Message was sent through the cbm-hackers mailing listReceived on 2017-09-06 14:03:45
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