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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.


3D Sound Audio Delay
Posted on Monday, October 18, 2010   •   Category: Miscellaneous


It is fun to make a variable space in your small room, but it’s hard to make the actuator to move your wall or room partition. Using analog audio line delay, you can adjust your room virtually. Just turn a knob in your audio set and you can adjust your room size. The circuit described here will make your dream come true, giving a feel that your speaker is located 15 meters behind you, even though your room is actually 3 meters wide. Here is the circuit’s schematic diagram.


SG3525 DC Converter 12V to +35V,-35V
Posted on Monday, October 18, 2010   •   Category: Power Supplies


The selected switching topology is called a "push-pull" converter, because the transformer has a double primary (or a "center-tapped" one, if your prefer). The center tap is permanently connected to the car battery (via an LC filter to avoid creating peaks in the battery lines, which could affect other electronic equipment in the car). The two ends of the primary are connected to a pair of paralleled MOSFETs each that tie them to ground in each conduction cycle (Vgs of the corresponding MOSFET high).


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