Lebro Posted October 27, 2021 Report Share Posted October 27, 2021 Circuit diagram added to above post. Bob Quote Link to post Share on other sites
Keith Warren Posted May 20, 2022 Report Share Posted May 20, 2022 Hi Steve Just picked up on this thread, I have a smart screen on my CP six and was caught out in the rain this week it was of no use at all, I know it’s cheeky but have you any of your kits left over? great work you have done Keith Quote Link to post Share on other sites
trchris Posted May 21, 2022 Report Share Posted May 21, 2022 Hi Keith I bought one of Steve's intermittent wiper relay kits which I will not use as plans have changed on the tr6 it was for if you are interested let me know Chris Quote Link to post Share on other sites
Keith Warren Posted May 21, 2022 Report Share Posted May 21, 2022 Hi Chris Sent a mail through I think, not done one for a long time, but would like to take you up on your offer. Keith Quote Link to post Share on other sites
BlueTR3A-5EKT Posted August 24, 2022 Report Share Posted August 24, 2022 Years ago I thought about searching for a kit and found this. Have just found it again. How does it compare? Will it do a single speed Sidescreen car DR3 type wiper motor? http://www.velleman.co.uk/contents/en-uk/p204.html Quote Link to post Share on other sites
RogerH Posted August 24, 2022 Report Share Posted August 24, 2022 Hi Pete, that will do a simple Intermittent wipe very nicely. The output relay will short the motor earth the ground at set times. The timer control knob can be removed from the PCB and piggy backed on a long lead Roger Quote Link to post Share on other sites
Lebro Posted November 9, 2022 Report Share Posted November 9, 2022 (edited) Well the very modified wiper delay unit (as at start of this thread) I used in my '3 had misbehaved once too often, so yesterday I pulled it to bits, & have now constructed a very simple one which works on any type of motor. Circuit: FOR LATER LIVE SWITCHED MOTORS (later TR's) FOR EARTH SWITCHED MOTORS (TR2/3 etc) The 1st version I found on the internet, the 2nd (lower) one is my interpretation configured for my TR3. Once I found the best value to give a 5 second delay, I replaced the variable resistor with a 39K fixed one to improve relliabilty. Had all the bits "in stock" so cost nothing to make, built it on a scrap bit of veroboard, and mounted it inside the casing of the discarded Landrover delay unit ! then strapped to motor as before. Bob Edited November 9, 2022 by Lebro Quote Link to post Share on other sites
RogerH Posted November 9, 2022 Report Share Posted November 9, 2022 Nice one Bob Roger Quote Link to post Share on other sites
Steves_TR6 Posted November 10, 2022 Author Report Share Posted November 10, 2022 Good work Bob ! Quote Link to post Share on other sites
Lebro Posted November 10, 2022 Report Share Posted November 10, 2022 Only slight oddity about this circuit is that when you switch it on there is a delay before the 1st wipe. Most do a wipe straight away. It's not a problem, just different ! Bob Quote Link to post Share on other sites
BlueTR3A-5EKT Posted November 10, 2022 Report Share Posted November 10, 2022 26 minutes ago, Lebro said: Only slight oddity about this circuit is that when you switch it on there is a delay before the 1st wipe. Most do a wipe straight away. It's not a problem, just different ! Bob Capacitor charging up? Quote Link to post Share on other sites
Lebro Posted November 10, 2022 Report Share Posted November 10, 2022 Yes, exactly. It's a very clever circuit. Uses the long charging time of the cap for the delay, & then when the circuit trips to start the wipers the charge in the cap keeps the 2nd transistor on for long enough to get the wiper moving. Bob Quote Link to post Share on other sites
Ralph Whitaker Posted November 11, 2022 Report Share Posted November 11, 2022 Intermittent wipers were one of the things I missed when out in the TR this year. I didn1t really want to put any more switches on the dash, but wondered if it would be possible to use a light switch instead of the wiper switch, so that first position (sidelights) would give intermittent wipe, and second position continuous wipe. That way I could put the "wiper" knob on the switch and it would look standard. Would a standard fixed delay relay work under that scenario as there are lots on ebay. Ralph Quote Link to post Share on other sites
Lebro Posted November 11, 2022 Report Share Posted November 11, 2022 Ralph. That is exactly what I have done. It works well, you just need to run another wire from it to the wiper location. Bob Quote Link to post Share on other sites
RobH Posted November 11, 2022 Report Share Posted November 11, 2022 19 minutes ago, Ralph Whitaker said: Would a standard fixed delay relay work under that scenario as there are lots on ebay. If you mean a ready-made wiper delay relay (rather than an actual 'delay relay' which is a specific electrical component) the answer is maybe. It depends whether the relay contacts are wired to 12v. supply or or left 'floating', since an early car needs a contact which connects to earth while later cars need it to switch to supply. (as shown in Bob's schematics above). A ready-made wiper delay unit probably has the relay configured for the first diagram, switching 12v to the wiper, which is how most wiper systems work and is fine for a TR6 with the 14W motor. In order to use that on an earlier TR with the DR3-type motor it is necessary to modify the unit or to add another relay. For instance, this one cannot drive the early wiper motor, nor can it be modified easily : https://www.12voltplanet.co.uk/12v-universal-intermittent-wiper-timer-relay-5-sec-delay.html You would have to add another relay driven by this unit, so the contacts on the extra relay could be wired to earth as per Bob's second diagram. Quote Link to post Share on other sites
Lebro Posted November 11, 2022 Report Share Posted November 11, 2022 If there is enough interest I could consider making a batch. Maybe get some printed circuit made. Bob Quote Link to post Share on other sites
BlueTR3A-5EKT Posted November 11, 2022 Report Share Posted November 11, 2022 On 11/9/2022 at 5:55 PM, Lebro said: Well the very modified wiper delay unit (as at start of this thread) I used in my '3 had misbehaved once too often, so yesterday I pulled it to bits, & have now constructed a very simple one which works on any type of motor. Circuit: FOR LATER LIVE SWITCHED MOTORS (later TR's) FOR EARTH SWITCHED MOTORS (TR2/3 etc) The 1st version I found on the internet, the 2nd (lower) one is my interpretation configured for my TR3. Once I found the best value to give a 5 second delay, I replaced the variable resistor with a 39K fixed one to improve relliabilty. Had all the bits "in stock" so cost nothing to make, built it on a scrap bit of veroboard, and mounted it inside the casing of the discarded Landrover delay unit ! then strapped to motor as before. Bob Pedant time. TR 2-3* had a CRT wiper motor fitted that gets power from the dash on/off control switch and the motor is connected to earth to make the circuit. It has no self park TR3*-4had DR3 /3A wiper motor single speed with self park. The power started at the motor and the dash switch connected the earth circuit.plus motor earth for park TR4A-5-250 DR3A two speed unit power starts at the motor and the switch connects either single or two wires to earth to make it go fast or slow. Plus a motor earth for park TR6-8 14 W motor two speed and self park. with power starting at switch fed by 4 wires. Plus a motor earth Quote Link to post Share on other sites
Lebro Posted November 11, 2022 Report Share Posted November 11, 2022 Now we know Bob. Quote Link to post Share on other sites
AlanG Posted November 11, 2022 Report Share Posted November 11, 2022 5 hours ago, Lebro said: If there is enough interest I could consider making a batch. Maybe get some printed circuit made. Bob Hi Bob, Please put me down for a 4A one. Alan. Quote Link to post Share on other sites
Ralph Whitaker Posted November 11, 2022 Report Share Posted November 11, 2022 5 hours ago, Lebro said: If there is enough interest I could consider making a batch. Maybe get some printed circuit made. Bob Thats a definite yes please from me Bob. If using the light switch as stated does the intermittent relay stay on even when the wipers are switched to constant, in the same way the sidelights stay on when the headlights are selected. I have the standard single speed with self-park. Ralph Quote Link to post Share on other sites
PaulAnderson Posted November 11, 2022 Report Share Posted November 11, 2022 Bob, I’d also be interested in one for a (two speed) TR4A motor but not sure how I’d switch it. Will read the post from the beginning again and possibly other posts to recall it. Paul Quote Link to post Share on other sites
Lebro Posted November 13, 2022 Report Share Posted November 13, 2022 On 11/11/2022 at 3:55 PM, Ralph Whitaker said: Thats a definite yes please from me Bob. If using the light switch as stated does the intermittent relay stay on even when the wipers are switched to constant, in the same way the sidelights stay on when the headlights are selected. I have the standard single speed with self-park. Ralph Hi Ralph. Yes the circuit remains powered up in both "on" positions of the switch, the 2nd position simply overrides the delay unit to give continuous wiping. Quote Link to post Share on other sites
Lebro Posted November 13, 2022 Report Share Posted November 13, 2022 On 11/11/2022 at 10:23 AM, BlueTR3A-5EKT said: Pedant time. TR 2-3* had a CRT wiper motor fitted that gets power from the dash on/off control switch and the motor is connected to earth to make the circuit. It has no self park TR3*-4had DR3 /3A wiper motor single speed with self park. The power started at the motor and the dash switch connected the earth circuit.plus motor earth for park TR4A-5-250 DR3A two speed unit power starts at the motor and the switch connects either single or two wires to earth to make it go fast or slow. Plus a motor earth for park TR6-8 14 W motor two speed and self park. with power starting at switch fed by 4 wires. Plus a motor earth The circuit can be wired (or adapted) to work with all of the above except the CRT motor which has no self park. 1st step for anyone wanting to go this way would be to decide how to switch the circuit in. In the case of Tr3- 3A the simplest way is to obtain a light switch for the same car, & fit it in place of the normal wiper switch, then run the extra wire along the loom to the wiper motor location. I am not familiar with the switch arrangements on the later cars, so some research needed there. Any circuits I make are likely to be mounted outside of a standard car type relay, not inside as mine is, so how to enclose / protect it needs to be considered. Bob Quote Link to post Share on other sites
PaulAnderson Posted November 14, 2022 Report Share Posted November 14, 2022 (edited) Fuller details of the wiper motor types used in TR models is given in this helpful Post which for the TR4A shows TR4A – DR3A 75568A – two speed (shaft & gear 54714897, 120 degree sweep) and Tony T’s drawing on page two of this Forum page shows how the TR4A switch arrangement works Paul Edited November 14, 2022 by PaulAnderson Quote Link to post Share on other sites
Ralph Whitaker Posted November 15, 2022 Report Share Posted November 15, 2022 On 11/13/2022 at 12:35 PM, Lebro said: Any circuits I make are likely to be mounted outside of a standard car type relay, not inside as mine is, so how to enclose / protect it needs to be considered. Bob Presumably it can be fitted in a protective box under the dash somewhere. Ralph Quote Link to post Share on other sites
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