Flashing Blinking LED DD8E

133

01:50:28

Carefully reversed engineered the DD8E DIY suite kit set. by Tron Guignard

published 7 years ago

wyoelk

7 years ago

Here is a similar circuit with different values. Welcome to EC. http://everycircuit.com/circuit/5560830044405760

BillyT

7 years ago

The layout required work, not sure what leds are being emulated but most low current leds are 1.7V 2mA. If the desired flash rate, and the transistor type were to be named, a better circuit could be designed. For this circuit, try; http://everycircuit.com/circuit/5955002119225344

BillyT

7 years ago

@wyoelk a rough way of choosing biasing resistors for these type of circuit can be calculated by multiplying the led resistor X the transistors gain X 1.1, then adjusting the capacitor for flash rate. http://everycircuit.com/circuit/6269776581361664

wyoelk

7 years ago

Thanks for that info. I just use the EC leds of 20ma 600mv. Easier for noobies to use than trying to explain changing led values.

BillyT

7 years ago

@wyoelk, EC Leds are 2V 20mA and the circuit has trouble working with these settings.

wyoelk

7 years ago

So help me out here a bit. Why does the circuit have issues with the EC leds?

BillyT

7 years ago

@wyoelk The original circuit has a very low power supply voltage.

wyoelk

7 years ago

Yes but don't the EC leds in general work ok under the correct voltage?

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