Recent content by jerrybilt

Hi John, The source voltage will be lower than the gate voltage. Explaining common source configurations is similar to explaining common collector or emitter follower configurations - they should never work! And yes the IR 2113 is a good choice. Yes this is an n channel enhancement mode fet...

Thanks for the response chaps ... Much appreciated. Last things first. The resistor from the gate to ground is essential and will help protect the fet. The resistor will have no effect on the circuit operation as what is important is the time constant of this part. We can can calculate this...

For your consideration: Here is an ignition transformer drive circuit based on a commonly available HEX FET. The input is a standard TTL input and the pulse width is set by a monostable multi-vibrator (how ever one cares to implement it!). This is a "circuit fragment" where I have not...

Only one problem John, when the drive transistor turns off the transformer is effectively removed from the circuit as the common connection is left floating and the only thing completing the circuit is some parasitic capacitance that helps complete the circuit. The capacitor across the points...

The first thing I would do with this circuit is place a diode ( 1N4004 ) across the primary winding of the ignition transformer. The anode of the diode is connected to pin 2 and the cathode is connected to pin 1 ( + 12V). The other thing that I would do is to redesign the final drive to the...

Hello Das and welcome. I'm sure you'll find lots of expertise here to help you along your engine building adventures. Engine building will draw on many skills but before one embarks on making a 4 stroke diesel I would suggest one starts with a simple oscillating valve steam engine. The materials...

That's a good piece of info. I'll google it presently, but if I do not find it could you give us any more info. Many thanks Graham Jerry. Found it !!

Continuing with the set up process for machining the castings the next stage is to establish the "main" reference line ie. the line going through the cylinder and in line with the crank shaft also determine the "exact" centre. This line will be used fix the position of the mounting holes that...

Well noted Tom. I have started the project and I am detailing my work in " Work in progress" under "My Hit and Miss Engine". Please keep an eye on it. I have finished the jig for holding the castings and will be posting this work presently. Thanks for the advice, as said this is well noted. Jerry.

I don't know about the 2 stroke engines but I have investigated making models of diesel engines. The main problem is in making the injector and the injector high pressure pump to meter and inject the fuel. A much easier to make diesel engine is the "semi-diesel" engine like the Lanz Bull Dog...

Kye, the engine is a Rosebury Type A , 1/2 scale, and appears in this catalogue: http://www.ejwinter.com.au/image/data/pdf/E%20J%20Winter%20ME%20Supplies%20Catalogue%20July%202011.pdf See. Page 17. The latest price list can be downloaded from the ejwinter web site. The castings are goood...

Good idea on the keg Rod. I just might get one. About the port : I'll see what one of the local wineries can do. Some of the wineries are just up the road from me. The missus wanted to drive back home via the Alice ... I don't think she has enough leave for that so we'll be coming back through...

First things first. Congratulations on getting the new lathe. Did you do all the " non round" pieces like frame work crankshaft etc using a saw and a file? Looking at the pictures ... Excellent job! About a governer: the ball type will do the job and there will be so much " eye appeal" and...

Hi Paul, I think I'll also go on the paid tour also. We'll be coming back through the Vic. highlands. Jerry.

Greetings Dave. I will be driving to Brisvagas in April then heading off to Bundaburg. I don't care what the family will be doing but I'm going to the distillary.