Logic Probe by 74LS47
This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must connect the “Test” wire of the probe to the desired node of the circuit that we want to check.
Source: http://www.electronics-lab.com/projects/test/020/index.html
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Digital gain control of Opamp
The gain of U1 can be controlled by a digital binary 1248 nibble at ABC.
The gain at digital 000 is unity or 1 and the gain at various stages are set by 4051.
There are eight different gains as the steps of gain resistor network is chosen by 4051.
The on resistance of 4051 channel around 100E gets added to U1 pin 2 internal impedance.
You can use separate resistor networks with trimpots for each channel if you require
but keep the networks total burden on U1 pin 6 to around 10K, not less than than.
You can use this to set the gain of a amplifier with the help of a microcontroller.
Read more Source:http://schematics.blogspot.com/2005/01/digital-gain-control-of-opamp.html
Thank you.
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Simple PC Data Acquisition by AD7569
If you need to add simple data acquisition capabilities to your PC, then look no further than the Analog Interface Unit. The Analog Interface Unit (AIU) is a simple circuit that connects to a PC parallel port, and allows you to sample and output 8-bit analog signals under software control. Here are some of the features : * 8-bit ADC and DAC * Powered from the parallel port * 1Mohm input impedance. * Software selectable +/-1.25V or +/-2.5V input and output ranges
Read more source:http://www.alternatezone.com/electronics/aiu.htm
Thank you.
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