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6 Channel Audio Mixer
Posted on Tuesday, October 19, 2010   •   Category: Amplifiers


The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor.


5 - 30 Minute Timer
Posted on Tuesday, October 19, 2010   •   Category: Miscellaneous


A switched timer for intervals of 5 to 30 minutes incremented in 5 minute steps. Simple to build, simple to make, nothing too complicated here. However you must use the CMOS type 555 timer designated the 7555, a normal 555 timer will not work here due to the resistor values. Also a low leakage type capacitor must be used for C1, and I would strongly suggest a Tantalum Bead type.


Sound Operated Switch
Posted on Tuesday, October 19, 2010   •   Category: Miscellaneous


This sensitive sound operated switch can be used with a dynamic microphone insert as above, or be used with an electric (ECM) microphone.


1W Mono Amplifier with IC TDA7052
Posted on Monday, October 18, 2010   •   Category: Amplifiers


This circuit is a 1 watt mono amplifier using the TDA 7052 from Philips. It is designed to be used as a building block in other projects where a battery powered audio amplifier is required to drive a small speaker. It will operate best from 6 12 V DC and requires no heatsink for normal use.


Temperature Monitor
Posted on Monday, October 18, 2010   •   Category: Test and Measurement


Using a thermistor in the position shown makes a heat activated sensor. A change in temperature will alter the output of the op amp and energize the relay and light the LED. Swapping the position of the thermistor and 47k resistor makes a cold or frost alarm.


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