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# What do i need to make this?

Discuss What do i need to make this? in the Electrical Tools and Products area at ElectriciansForums.net

A

#### Alexdaman

Welcome to ElectriciansForums.net - The American Electrical Advice Forum

Hi there, im trying to make the two circuits below, its for a bell-ringing simulator, and i dont really understand circuit diagrams too well...

And also..

Im confused as to what GND (i assume the Debounce circuit is the top one) and also what the little symbol by GND means.

I would really be grateful if you could give product codes for suppliers, as im not too good on electronic symbols/diagrams.

Many many thanks,
alex

Last edited by a moderator:

#### mrloy99

##### -
Hi there, im trying to make the two circuits below, its for a bell-ringing simulator, and i dont really understand circuit diagrams too well...

And also..

Im confused as to what GND (i assume the Debounce circuit is the top one) and also what the little symbol by GND means.

I would really be grateful if you could give product codes for suppliers, as im not too good on electronic symbols/diagrams.

Many many thanks,
alex
eeh, the gnd and little symbol mean ground(0v)aka earth
D diode
R resistor
TR transistor
ic1 integrated circuit (microchip)
vr variable resistor
c capacitor
v volts
However if you havn't got the basics why are you even attempting ?

A

#### Alexdaman

Whats the worst that could happen?
I doubt a 9V battery shock would kill me.

How do you ground a circuit operated by a battery though :S

Last edited by a moderator:
J

#### Jono Pashley

you dont, the battery is seperate from earth and hence the earth path is incomplete and a circuit cannot be made through you and back to the battery, so no current is delivered

A

#### Alexdaman

So this can't actually be made using a 9V battery?

#### mrloy99

##### -
So this can't actually be made using a 9V battery?
I'm no electronics expert,but the way I read it gnd=0volt-----the negative of battery.But perhaps the drawing is suggesting 0v and 5-9volt and signal connections are derived from computer.?

A

#### Alexdaman

thats what i initially thought, because on the website it says that the power can be drawn from an external source (9-5V) or through the PC. I thought the same about the Grounded end being the negative side to the battery

M

Hi there, im trying to make the two circuits below, its for a bell-ringing simulator, and i dont really understand circuit diagrams too well...

And also..

Im confused as to what GND (i assume the Debounce circuit is the top one) and also what the little symbol by GND means.

I would really be grateful if you could give product codes for suppliers, as im not too good on electronic symbols/diagrams.

Many many thanks,
alex

is gnd ground the zero volt point on the computer input or is it the -ve point of a bridge rectifier circuit ie output ground or even transformer ground ?

sorry cant be more specific

cheers

#### DPG

##### -
Arms
Esteemed
Hi. Gnd is the 0V of the circuit, which will also be connected to the of the computer input. Don't think of it as an electrician type ground, think of it lik the negative (chassis) earth of a car. Is this circuit feeding into the parallel port of your computer?

Hope this helps, Daz.

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