LRCR wrote:

Jasen,

Thank you for your response. I am having trouble reading your ascii
schematic. Also "Fixed font" I don't understand. I am excited to
understand your circuit. You have to excuse me since I am new in
reading ascii schematic. As you can see my ascii schematic is not
very good. Is there any way to send an attachment with a picture,
pdf or help me understand your ascii schematic?
Luis
On Fri, 03 Feb 2006 07:00:30 -0000, Jasen Betts
wrote:

On 2006-02-02, LRCR wrote:

video source---------------*-------------------Oscilloscope
|
|
75 ohm
|
|
C
0V or 5VDC--10k--------B 2N3904
E
|
|
-5VDC



(view with a fixed-pitch font)

this one may work a bit better

--+--- +5
|
10K
source | 2N3906
| 1N914 |
| +--|--+-------C E-------+---- -5
| | | B |
\ 150R === 100pF |---[33k]-'
\ / | 1K .---[10K]-- control
X --+-- 0V | .2N3906 | (0 or 5V)
/ \ | C ' B
/ 150R === 100pF B---[10K]--+-C E-- 0V
| | | E | `.
| | | |--[33K]-. 47K 2N33904
| | | B | |
| +--|--+-------C E------+--+--- +5
| 1N914 |
scope | 2N3904
10K
|
--+--- -5

TTL-swittched broadband terminator concept.


Bye.
Jasen

Set whatever you are using for a news reader to use Courier font.
--
JosephKK
Gegen dummheit kampfen Die Gotter Selbst, vergebens.
--Shiller