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Miscellaneous Analog Schematics

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Variable Resistor and Light Dependent Resistor using PIC16f877

Variable Resistor and Light Dependent Resistor using PIC16f877

The circuit is straight forward. The 10k LIN variable resistor is at the ends connected to the + and - so that the PIC input can cover the full range. This because the AD routine can only convert a voltage. So whatever you want to measure the resistance of it has to be connected in such a way that it acts as a voltage divider.

http://members.home.nl/b.vandam/lonely/pagina7.html

One Pot to Control Two Channels

One Pot to Control Two Channels

Here's a clever design idea lifted from the pages of Electronic Design. Stephen Woodward has designed a circuit that allows one pot to adjust two channels.

http://www.web-ee.com/Schematics/DualChannelPot/DualChannelPot.htm

using Visual Basic

using Visual Basic

How to use the PC to connect to a Nutchip in order to read a remote control, to sense a smart-card, to enable outputs or to read inputs? Here are serial communication secrets, from the protocol to a working example. Source code is provided.

http://www.nutchip.com/progetti/vb_sample/vb_sample_en.htm

Broaband Return Loss Bridge

Broaband Return Loss Bridge

http://www.qsl.net/n9zia/wireless/appendixF.html#11

Slew Rate Control

Slew Rate Control

A circuit that limits the rate of change of a signal; a feature of this design is that the positive and negative rates can be different.

http://freespace.virgin.net/ljmayes.mal/pubs/slew.htm

LM3909 replacement using discrete components

LM3909 replacement using discrete components

http://home.cogeco.ca/~rpaisley4/LM3909.html

G Strain energy absorber

G Strain energy absorber

http://jnaudin.free.fr/html/gseadiag.htm

Matching 75 Ohms to 50 Ohms

Matching 75 Ohms to 50 Ohms

The easiest way is to use resistors. A two way matching network uses a 43.3 ohm and 86.6ohm resistors

http://www.old555.com/LPE/unit/77866AD477405881.shtml


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