Re: Is it at all possible?

i just assumed that since L4 sits in the power input it would have a value
"window" you could not get outside

will keep in mind that you have scrap boards

2017-02-19 0:15 GMT+01:00 Mike Stein <mhs.stein@gmail.com>:

> L4 is a common-mode choke, part of the RF filter network; not very
> critical. See:
>
> http://www.digikey.com/products/en/filters/common-mode-chokes/839/page/24
>
> Sounds like Santo's got everything covered but I've got a number of scrap
> 326298 boards in my piles of broken and working C64s if that can be of any
> help.
>
> mike
>
> ----- Original Message -----
> *From:* Bo Herrmannsen <bo.herrmannsen@gmail.com>
> *To:* cbm-hackers@musoftware.de
> *Sent:* Saturday, February 18, 2017 5:12 PM
> *Subject:* Re: Is it at all possible?
>
> my work so far are now public here: https://github.com/
> boelle/C64-Schematics-Boards/tree/master/From%20Programmer'
> s%20Reference%20Guide
>
> the only unknow to me is L4 which is located in the very top right corner
> (inductor with red and green wire on it), but i guess a bit more deep
> searching should give me a value for it
>
> 2017-02-18 20:39 GMT+01:00 Santo Nucifora <santo.nucifora@gmail.com>:
>
>> I added head-on pics of the 326298 Rev A and C boards. Sadly, the back
>> has a metal shield soldered onto both boards that will be difficult to
>> remove and I'd like to keep these as working boards so front pics only.
>>
>> On Sat, Feb 18, 2017 at 2:31 PM, Gerrit Heitsch <
>> gerrit@laosinh.s.bawue.de> wrote:
>>
>>> On 02/18/2017 08:15 PM, silverdr@wfmh.org.pl wrote:
>>>
>>>>
>>>> On 2017-02-18, at 09:36, smf <smf@null.net> wrote:
>>>>>
>>>>> "The sweet spot is a 250466 board
>>>>>
>>>>
>>>> Precisely…
>>>>
>>>> The VIC chip on those boards is a R5, which gives the clearest picture.
>>>>> "
>>>>>
>>>>
>>> Not quite... You can get a clear picture from a 6569R1, 6569R3 or 6569R4
>>> (that one is rather rare) as well. The problem on the older boards is
>>> mostly the modulator. Replace it with a simple video amp and you will have
>>> a very good picture. Ok, you lose the RF output, but who is using that
>>> anymore?
>>>
>>>
>>> It also has the 8 pin video port, not 5 pin like the earlier ones.
>>>>>
>>>>
>>>> Which is also not fully correct. Should read "like some of the earlier
>>>> ones". Not all earlier boards had 5-pin A/V socket.
>>>>
>>>
>>> Even the old KU board already has the 8pin Video out.
>>>
>>>  Gerrit
>>>
>>>
>>>
>>>
>>>       Message was sent through the cbm-hackers mailing list
>>>
>>
>>
>


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