Sonorous tester of short circuits. please, urgent! - Page 3 - Electronic Circuits Projects Diagrams Free

**kinjalgp** · 6th April 2003, 10:46 AM

VR1 is variable resistor or potentiometer. You must have seen it as volume control knob on cassette player/radio.

bogdanfirst · 6th April 2003, 04:50 PM

how about the values of the components?

gothmog_es · 7th April 2003, 01:15 AM

Oh, i only saw potentiometer symbol without ground. Thanks kinjalgp.

bogdanfirst, excellent question. Values will be essential if i can change the project!

**mechie** · 10th April 2003, 01:33 PM

Sorry for not answering sooner but things here are hectic...
I would suggest the following values for the circuit, I am not a great believer in being choosy with components, I prefer to see what is in my bits box :wink:

I never considered component values earlier as it would have been a waste of time if no-one wanted them...

Is somebody planning to try this circuit out :?:
It's still untested but should work "as-is", I will test it if there is interest in the results :?

R1, R2 = 100k
Ra2 = 1k0
Ra3, Ra4, Ra5, Ra6, Ra7, Ra8 = 10k
Ra9 = Prbably not required - 1k0 or short out
VR1 = 22k or 47k LOG, not fussy
C1 = 22n
C2 = 100u, 25v
T1 = 2N3904
T2 = 2N3906
IC1 = LM148 or any two op-amps
Speaker = any small transistor radio speaker, maybe 8 Ohms or so.

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6th April 2003, 10:46 AM	(permalink)
kinjalgp	VR1 is variable resistor or potentiometer. You must have seen it as volume control knob on cassette player/radio. __________________ "There is no way to peace, peace is the way!"

6th April 2003, 04:50 PM	(permalink)
bogdanfirst	how about the values of the components?

7th April 2003, 01:15 AM	(permalink)
gothmog_es	Oh, i only saw potentiometer symbol without ground. Thanks kinjalgp. bogdanfirst, excellent question. Values will be essential if i can change the project!

10th April 2003, 01:33 PM	(permalink)
mechie	Circuit Values Sorry for not answering sooner but things here are hectic... I would suggest the following values for the circuit, I am not a great believer in being choosy with components, I prefer to see what is in my bits box :wink: I never considered component values earlier as it would have been a waste of time if no-one wanted them... Is somebody planning to try this circuit out :?: It's still untested but should work "as-is", I will test it if there is interest in the results :? R1, R2 = 100k Ra2 = 1k0 Ra3, Ra4, Ra5, Ra6, Ra7, Ra8 = 10k Ra9 = Prbably not required - 1k0 or short out VR1 = 22k or 47k LOG, not fussy C1 = 22n C2 = 100u, 25v T1 = 2N3904 T2 = 2N3906 IC1 = LM148 or any two op-amps Speaker = any small transistor radio speaker, maybe 8 Ohms or so. __________________ I need a memory upgrade ... My head is full !