So in case anyone ever has the same problem (though I tend to have problems no one else ever has...) the solution was ...a new reedswitch. I still don't understand but in desperation I bought massively over-rated reedswitches ( by current and voltage). After replacing the problem switch it then...
My wife asked me to make a honey heater. They are normally pretty basic with a wooden box and 2 40w light bulbs. However when our desktop washing machine broke I grabbed the opportunity as its a ready made cabinet. I found a really cheap 240v thermostatic controller with temperature probe and...
Hiya. Yes the replaced led is wrong. As i said in first post i can trace from the positive output of the bridge rectifier from led to led back to the negative on the rectifier.....so that suggests a forward voltage of 7.5v. Going to try injecting voltage to each led to check. But if it's leds in...
Trying to repair this uplighter LED array for a friend. I am suitably puzzled. Mains at 230Vac comes in via 2 fuses and I measure 211VDC at the pins of the bridge rectifier. I can then follow the circuit from the positive terminal of the bridge rectifier via 28 LEDs in series to the negative...
Blobs represent where wires attach to the pcb. Black wires run to microswitch at right hand end of twin impeller pump. That correctly operates the circuit. Attach white wires but no microswitch (so open circuit) the motor still responds to the black connected switch. Attach the microswitch to...
So this is the simplest Mosfet circuit possible. Its in a shower pump I bought as a backup. The mains input (230vAC) comes to one side of the mosfet (BTA08 600b). A feed to the gate goes via a resistor (12k) and two reed switches which are triggered closed by magnetic floats in the pump. The...
I am flummoxed. This is a commercial circuit from a pump. It incinerated the resistor and the thyrstor. The thyrsitor is correct but when i connect the pump and energise the reed switch it works once or twice then the thyristor burns out.
The only variable is the resistor size. Its on a 240V AC...
Talk about feeling stupid. This is the simplest of circuits. a BTB08-400B was used to switch a water pump via two reed switches that are triggered by magnetised floats in the pipes. The reed switches feed via resistor to the gate. So turn the tap on the flow starts and the floats rise triggering...
Trying to get a simple world clock to work consistently. The pcb is really simple. This is close to the only discrete semi ( a c9013 transistor) other tgan the main chip. Its has no markings and is about 5mm duameter and 9mm tall. Initially I thought it was a capacitor across the main battery...
So I have a 230v a.c. supply switched pump that uses the exact circuit below. After a major failure the resistor was fried. I am puzzled by my calculations as the resistor in the circuit was no where near the wattage. I take the 230v a.c. and tb at gives me a peak of say 330v. The gate current...
Hi am trying to repair a potters wheel with electronic control of a 180V DC motor. Can anyone help me find a more available equivalent to the main power semiconductor which is marked G20T65D HT H0601. Any help greatly appreciated
Uh.. an Sot223 case is clearly an active component. its got three legs on one side and an earth/ground on the other. I clear;y stated the case is marked UL25...so no its not an inductor or a PCB marking.
Trying to repair a non-responsive 12V DVD player from my car. Found a shorted area (looked like a burnt out piece of fluff) that appears to have damaged a resistor and so I suspect the closest semi as well. The semiconductor is in a SOT223 type package (though appears larger with the actual unit...