|------|
|--| 10k |---------
| |------| +5V | |------|
-----| |\| | 12V o---| 7805 |--------o +5V
| |-----------|-\ | |------| |
| | 10nF | >---- | --- 100nF
| --- |--|+/ | --- --- //
| --- | |/| --- | 100uF
| | | --- | | 10k ---
| --- | comp | |
| | ---
| | |
| --------------
| | |
| --- ---
| 10k | | | | 10k
| | | | |
| --- ---
| | |
| +5V o--| --- +12V
| | |------
| --- o |
| 8k2 | | Load ---
| | | o / \
| --- | |
|----------|------| |\ |------
--- --|-\ A B |---
10k | | C D | >-----o------o----| Power Mosfet
| |<-o--o-|+/ |->- (will look up #)
PWM depth | | |/ |
--- comp |
| ---
---
8k2 | |
| |
---
|
---
-------------------> D
o---+5V |\ | |
"touch" | \ |--- |
o------------------| >---------->| 1/4 4066 --- 1uF
| | | / |--- --- MkM
1MOhm --- 1nF | |/ | |
| | --- CMOS E o ---
| | --- Buffer |
--- | (e.g. 1/4 |
| | 74HC00) F o |------|
--- --- |---| |---o Udes
|------| (e.g. 0V,
2.5, or 5V)
EF can be broken to force a voltag eon E. Otherwise, a slow intensite change results to Udesired.
To drive units with zero mass connection (usual in cars), a
p channel fet could be used (if availalble), or this
circuit extension:
|\| |-------|
|---| |--------| 78L05 |--
| |/| | |-------| |
| --- | |
| --- | |
| | | |
+12V o-------------------------------|------------------------|-----
| | | | |
|------| | | --- -------- |
----| |----|---| | \ / | |
| |------| |\| | | --- |\| |
| | \ | | | | | | \ |---
|-------------| >O-|---| |---|---- >---| >-------|
--- | / | | PWM in | / |->-
--- |/| |/| |
| Schmitt tr. --- |
| | Buffer o
| | (TTL in ?) Rload
| | o
| | |
0V o--------------------------------------------------------------
Possible bandwidth for decreased modulation index, geometrically locked channels (between stationary objects, possibly behind windows? Might be sufficent to have a cheap, supplier independent high speed computer link. How about a block IP equivalent, and mulitple controlled dish units? Just hope the neighnours leave their equipment on when they leave, or at least some of them. What would be the range? The price shouln't be the problem, servos are relatively cheap, optical dishes are mass producable, laser diodes exist,...