reading diagram   - Page 1
Forum section: electronics / beginners

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 09:12:54 am
content: Hi Guyssilly question but can some show me how to wire this please

author: IanB
author_rank: Super Contributor
timestamp: December 01, 2015, 09:15:27 am
content: The diagram seems clear. What aspect of it is causing a problem?

author: tautech
author_rank: Super Contributor
timestamp: December 01, 2015, 09:18:31 am
content: RV means variable resistor eg pot or preset etc.This configuration is not uncommon with the wiper and one end on the pot "commoned".

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 09:26:13 am
content: so the pot is just is series and the common is connected to the centre pin ??

author: tec5c
author_rank: Frequent Contributor
timestamp: December 01, 2015, 09:27:57 am
content: A potentiometer/variable resistor will have aminimumof 3 pins. Across two of them will be the maximum resistance value, while the third pin is used as a wiper (variable resistance pin). A quick check with a multimeter (or datasheet if you have access) will tell you which pin is the wiper. Once you know which pin is what, wiring it up should then be quite trivial.Do you have a specific component you are trying to wire up? If so, please post a photo of it or link to a similar one.

author: Gyro
author_rank: Super Contributor
timestamp: December 01, 2015, 09:50:30 am
content: QuoteYes, basically. The center pin (wiper) is connected to one of the outer pins and to common (the schematic uses the chassis symbol - check that this is actually meant and is a safe thing to do).Which outer pin you connect to depends on which direction you want to turn the pot to increase or decrease resistance.

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 10:28:10 am
content: So like this ??

author: tron9000
author_rank: Frequent Contributor
timestamp: December 01, 2015, 10:31:43 am
content: Quote from: Jbliss on December 01, 2015, 10:28:10 amhow you've got it is shorting the power to the chassis. - not good.

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 10:38:14 am
content: its a common 0v

author: Delta
author_rank: Super Contributor
timestamp: December 01, 2015, 10:48:18 am
content: Quote from: Jbliss on December 01, 2015, 10:28:10 amThat will work great. At ensuring zero output...

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 10:55:06 am
content: Can someone draw the correct way Please

author: Deathwish
author_rank: Unknown
timestamp: December 01, 2015, 11:04:21 am
content: as asked per original diag

author: Joule Thief
author_rank: Regular Contributor
timestamp: December 01, 2015, 11:07:54 am
content: Quote from: Jbliss on December 01, 2015, 09:12:54 amtry

author: SL4P
author_rank: Super Contributor
timestamp: December 01, 2015, 11:12:28 am
content: a potential problem as drawn...at one end of travel, the high side will be 0R to chassis !

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 11:34:32 am
content: Heres is the full Preamp Circuit

author: SL4P
author_rank: Super Contributor
timestamp: December 01, 2015, 11:36:50 am
content: all good.use JouleThief's wiring diagram.Comment: using arbitrary arrows or symbols can suggest signal conditions that aren't actually present in the actual circuit. The full schematic tells us what/how the VR is being used in the circuit, so how it is wired up becomes apparent.

author: Delta
author_rank: Super Contributor
timestamp: December 01, 2015, 11:43:21 am
content: Please always post full schematics, instead of tiny snapshots. Also, take a step back and look at what you've drawn. Surely after 10secs of looking at your sketch you would see that that arrangement couldn't possibly do anything...

author: Jbliss
author_rank: Regular Contributor
timestamp: December 01, 2015, 12:34:22 pm
content: Yeah sorry realised as soon as i posted it

author: fleuroman
author_rank: Contributor
timestamp: December 02, 2015, 12:54:10 pm
content: RV1 is extending the voltage divider created by R1 and R4, a simple volume control, so it will work with either pin 1 or pin 3 of RV1 grounded, it might just work backwards to how you want it to work, the contacts/pins on RV1 should be numbered 1, 2 and 3, not 1, nothing and 1 as in the diagram

author: tron9000
author_rank: Frequent Contributor
timestamp: December 03, 2015, 08:38:23 am
content: Quote from: SL4P on December 01, 2015, 11:36:50 amHence why I assumed power on OP's last schematic.