What if increasing voltage from 12vdc to 36 on a turn signal relay.

[killivolt]

Exactly My dear Wattson.

Try one of these on-line 555 calculators:
**broken link removed**
Some starting values for you:
R1 = 2.2K (Enter as 2200)
R2 = 100K (Enter as 100000)
C1 = 10uF (Enter as 10)

You knew I couldn't do it myself. Just what I needed.

Thanks.

kv

 

[killivolt]

Reducing duty cycle on 555 Astable.

This will not affect my circuit I'm building. However, now I have questions concerning limitations with Astable 555.

I was using different values on the 555 calculator and couldn't get it below 50% Duty Cycle.

Does this mean going below 50% can only be program to do so ?

kv

 

[Hero999]

You have to add a diode to get below 50% (see datasheet) or you could connect the load from pin 3 to +V.

 

[killivolt]

1n4148 or something else ?

You have to add a diode to get below 50% (see datasheet) or you could connect the load from pin 3 to +V.

1n4148 was used a lot on some of the circuit boards we built that required pulse width modulation.


Thanks hero999



kv

 

[killivolt]

Darlington Circuit used on relay's.

you could connect the load from pin 3 to +V.

A Darlington Circuit with a relay. Posted in another thread seemed to me to be an example of what your talking about when your controlling the Duty Cycle.

Would that be accurate ? Correct me if I'm wrong.


kv

 

[rezer]

1n4148 was used a lot on some of the circuit boards we built that required pulse width modulation.


Thanks hero999



kv

You can use the 1n4148 with the 555.