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Offline Robert JakimskiTopic starter
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« on: February 23, 2017, 07:22:25 am »
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Hi guys.

I need help witch the delta pulse 2 problem is with the volume pot in schematic the pot is 100R, someone told me we can use 500R to 1K pot when i use 470R pot delta pulse works super and when i changed to see the diference to 1K pot ne555 is burning can you tell me what is the problem i changed only 1 resistor r43 to get 100hz from ne555,second problem is the treshold is not working for me.

Thx for help


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« Reply #1 on: February 23, 2017, 09:25:52 am »
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  Changing the Pot should not have been a issue unless it was shorted.  What did you do to R-43 ?  

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« Reply #2 on: February 24, 2017, 04:30:49 am »
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Hi.

I changed R43 to 100k resistor to get proper frequency, today I will measure the frequency on ne555,and will do a movie with the 2 pots.Pot witch 470r is working good and pot with 1k is burning ne555,about the treshold in auto mode i dont see working the pot but when i change to manula and I am touching the wires of the pot I get another sound in the speaker.

sorry guys for my english.

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« Reply #3 on: February 24, 2017, 08:36:07 am »
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  Your changes should be within the NE555's limits and functions good.   Looking at the schematic it looks like they are supplying the 555 with 24vdc.     It's only rated for like 15vdc.   On other Delta schematics it shows the same set up.

The output circuit is capable of sinking or sourcing
current up to 200 mA. Operation is specified for
supplies of 5 V to 15 V. With a 5-V supply, output
levels are compatible with TTL inputs.

What's with that ?   What voltage do you see between NE555 pins  1 and 8 ?

I notice on another Delta schematic there is no pot .

This detector project seems to have has a pile of issues.   Look around in here and you may find a  common problem. 

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Offline Robert JakimskiTopic starter
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« Reply #4 on: February 25, 2017, 11:26:06 am »
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Hi.

I am using 14,50V power supplay for delta pulse 2 just measured the voltage on 1 and 8 pin and it is 13,10 v i changed the pot to 1K and the ne555 was burned again but with the pot 470R is working good about the treshhold the pot was defected,can you guys measure the voltge in lm555 please.

THX for help


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« Reply #5 on: February 25, 2017, 11:29:10 am »
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  I don't have access or have build this detector.  Someone may be able.

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« Reply #6 on: February 25, 2017, 01:11:38 pm »
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What is the Ohms of your speaker ?  Something is pulling too much current.  Did you test the Pot to see it it's not shorted or something ?

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