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Index 39

LM555 Astable Oscillator Circuit Diagram

Published:2013/5/16 2:03:00 Author:muriel | Keyword: LM555 , Astable Oscillator

LM555 Astable Oscillator Circuit Diagram
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LM555 Monostable Oscillator Circuit Diagram

Published:2013/5/16 2:02:00 Author:muriel | Keyword: LM555, Monostable Oscillator

LM555 Monostable Oscillator Circuit Diagram
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Fixed Voltage Regulators

Published:2013/5/16 1:58:00 Author:muriel | Keyword: Fixed Voltage Regulators

Fixed Voltage Regulators
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Generally, plug-in transformers

Published:2013/5/16 1:58:00 Author:muriel | Keyword: Generally, plug-in transformers

Generally, plug-in transformers
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LM311 Comparator Controlled H-Bridge schematic

Published:2013/5/16 1:56:00 Author:muriel | Keyword: LM311 Comparator , Controlled H-Bridge schematic

LM311 Comparator Controlled H-Bridge schematic
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3Amp - DCC Booster Circuit

Published:2013/5/16 1:56:00 Author:muriel | Keyword: 3Amp, DCC Booster Circuit

3Amp - DCC Booster Circuit
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Low Voltage H-bridge 2

Published:2013/5/16 1:55:00 Author:muriel | Keyword: Low Voltage H-bridge

Low Voltage H-bridge 2
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Generating -5VDC from +5VDC

Published:2013/5/16 1:52:00 Author:muriel | Keyword: -5VDC from +5VDC

Generating -5VDC from +5VDC
If you happen to have the March 1984 issue of Radio-Electronics, turn to page 78. This issue has the very first instalment of Robert Grossblatt's Designer's Notebook column. In it, he shows a simple circuit which will supply a negative voltage, given a positive voltage. It's basically a 555-based oscillator, and a voltage-doubling rectifier. He claims the negative-voltage output should be good for about 60ma. No-load voltage should be pretty close to the input voltage (but negative), although the voltage will drop a bit, depending on the load. If you put +5V into the circuit, it'll give you around -5V out. load. If you put +5V into the circuit, it'll give you around -5V out. If the load makes the voltage drop too low (-3V or -4V), you could always just feed the circuit with a higher voltage (like maybe 9V or 12V) and then just regulate the output down to -5V using a 7905 regulator. I've used this circuit a couple of times for powering op-amp's, and it works great! I'm not that great at ASCII-art, but I'll give it a shot. If the following schematic doesn't make sense, let me know, and I'll try it again...Note: In the above diagram , both diodes point down (the anodes are at the top). Also, watch the polarity of C1 & C3. The circuit is set up to oscillate at about 45kHz, with a duty cycle pretty close to 50%. None of the values of any of the parts are terribly critical, so if the capacitors or resistors are in the ballpark , it should still work okay. (View)

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smitt-trigger

Published:2013/5/16 1:51:00 Author:muriel | Keyword: smitt-trigger

This is a smitt-trigger (a circuit with hysterysis) which alternating charges and discharges a capacitor through a resistor. If the output voltage is low the upper led is lighted the current throug the led is limmited by the series resistor. If the output is high the lower led is lighted. (View)

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Ultrasonic transducer oscillator circuit

Published:2013/5/16 1:50:00 Author:muriel | Keyword: Ultrasonic transducer oscillator circuit

Ultrasonic transducer oscillator circuit
Allows the transducer to oscillate at its self-resonating point, with no tedious setup. As far as I can tell, the circuit will run on 5V-9V. (View)

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single-transistor phase splitter

Published:2013/5/16 1:49:00 Author:muriel | Keyword: single-transistor phase splitter

single-transistor phase splitter
The circuit uses the inverting properties of an emitter follower with a collector load. You have to experiment for a value of R and the pot that will keep the transistor's power dissipation within limits given the V+. The output stage should be buffered by another emitter follower stage, or an op amp, etc. Note that this circuit induces some loss in the p-p value of the signal, too. It is not completely distortionless, but reasonable if you do it right. The same topology can be employed with op amps: One inverting and one non-inverting with the pot between their outputs, buffered by a third op amp. (View)