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I Can't See All My Gauges!
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Oct 15, 2009 6:36 am    Post subject: Reply with quote

Pity, I'd have posted you one of mine, CPC are 20 mins away.

Ah well.
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Thu Oct 15, 2009 7:15 am    Post subject: Reply with quote

Don't forget to post a diagram of your circuit

Scan a hand drawing or use Microsoft Paint
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Thu Oct 15, 2009 7:53 am    Post subject: Reply with quote

Not got that far yet....
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Sun Oct 18, 2009 6:10 am    Post subject: Reply with quote


OK thinking of using this as my circuit design



This circuit is designed to test phototransistors with an analog meter without causing any additional current drain and volt drop.

The two 9v batteries will be replaced by a 7805 regulator.

R1 will be replaced by a trim pot.

The two arrow that indicate test leads for thephototransistor circuit will be the "ground" and "hot " connections on the MAP sensor

The Map Sensor will also be powered by the 7805 regulator.

Full info here http://home.cogeco.ca/~rpaisley4/xHiZmeter.html
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Sun Oct 18, 2009 7:04 am    Post subject: Reply with quote

Like this


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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Sun Oct 18, 2009 7:38 am    Post subject: Reply with quote

No need for the diodes there, I'd use a unidirectional suppression diode to clamp the incoming voltage to 18v or under but even then the voltage reg will sort anything up to about 40V.

I would also put a resistor in the line form the amp out and amp - to give a bit of damping. Taht will respond instantly (Pretty much) a resistor will give a tiny ramp up.

Not started mine as my gauge hasn't turned up and I'm re-looming my electric mirrors!
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Sun Oct 18, 2009 7:53 am    Post subject: Reply with quote

You mean like this. What value R2 or what about a trim pot?


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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Sun Oct 18, 2009 8:17 am    Post subject: Reply with quote

Left a bit...

I found these helped:
http://www.allaboutcircuits.com/vol_3/chpt_8/index.html

Instrument amplifier
http://sub.allaboutcircuits.com/images/03046.png
(All R the same R gain varies the overall gain of the circuit.)
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Sun Oct 18, 2009 8:52 am    Post subject: Reply with quote

Rich H wrote:
Left a bit...


Left a bit ?????




Hmm, I will have a read. Thanx.

My MAP sensor hasn't arrived yet, op amps have though.
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Sun Oct 18, 2009 9:03 am    Post subject: Reply with quote

Try this:

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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Sun Oct 18, 2009 9:11 am    Post subject: Reply with quote

Ok

I will

Thanx RC, knew i wasn't too far out. will start prototype board so that when Map arrives i can give it a go. I got enough components now to make ti all again nice and neat if it works OK.
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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Fri Oct 23, 2009 8:13 am    Post subject: Reply with quote

Arrived yesterday, just before the post strike kicks in.
Gona be working on my Vespa this week end but will crack on with getting this together on Monday

2 bar MAP sensor

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924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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Rich H  



Joined: 10 Jun 2007
Posts: 2665
Location: Preston, Lancs, UK

PostPosted: Fri Oct 23, 2009 10:17 am    Post subject: Reply with quote

Still waiting for my bl**dy gauge!
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1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec
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RC  



Joined: 25 Mar 2007
Posts: 2624
Location: Australia

PostPosted: Fri Oct 23, 2009 11:35 am    Post subject: Reply with quote

Good to see you got a connector with it. These unique/ specialised plugs often end up costing more than the unit they fit.
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9XX Girl!  



Joined: 20 Sep 2009
Posts: 1617
Location: Cornish Riviera SW England

PostPosted: Fri Oct 23, 2009 11:45 am    Post subject: Reply with quote

RC wrote:
Good to see you got a connector with it. These unique/ specialised plugs often end up costing more than the unit they fit.


Yep, it was an eBay purchase (6 inc postage). I messaged the seller asking them to include a bit off the harness too. The seller did so at no extra cost. Gonna solder longer tails on, shrink sleeve each joint and then black heat shrink over the whole lot. Will stager my joints too in order to reduce a bulky bit in the harness.
_________________
924 (84) N/A 2 ltr - 5 Speed - BLACK - Project (looking for 200BHP, any ideas!)
924 (81) N/A 2 ltr - 3 Speed Auto - SURINAM RED (Metallic) - Near Original Spec (sticking with originality)
BOTH ON THE ROAD, BOTH USED EVERY-OTHER DAY
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View user's profile Send private message
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