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>> Home > Tags > oscillator

Launch ELAINE, by RNinMunich Fleet Admiral!   Posted: 19 days ago
Thanks for the 'electricals' pics! Definitely a triple XXX Home brew. DCC90; would appear to be an RF double triode. Used as an RF amplifier and/or oscillator. Possibly in the UHF band. Trying to find some decent specs on it. If yours is dud there are still some around for a tenner or so; Must dig around in the cellar; somewhere I have a box of valves too! (Surprise surprise! I hear you say😉) Cheers, Doug 😎 PS Here some history and data on the bottle. Up to 40Mhz apparently. PPS Valve data now attached in the PDF😊

Seeing the light by RNinMunich Fleet Admiral!   Posted: 4 months ago
Hi Peter, attached the pinout of the 555 and a circuit for an astable oscillator giving a square wave output suitable for a lamp flasher. Frequency (flash rate) is defined by R1, R2 and C. The bigger the 'C' and/or R1 the slower the rate. R2 defines the discharge rate. Therefore the ratio of R1 +R2 to R2 defines the ratio of On / Off times! A little experimentation needed. You can put your pot in place of R1 for some flash rate (F)adjustment. F=1/Cx(R1+2xR2). If you want to get really 'snazzy' you can use the 555 in monostable mode (pic 3) and use the pulse output from an RX channel as the trigger input. You may need to add a series capacitor and a resistor to ground (try a 10K to start with) to slow the trigger down a bit and experiment with the capacitor, a small electrolytic or Tantalum. It helps if you have an oscilloscope for such experiments! A cheap analogue 100Khz or 1Mhz job would do. The astable version is simpler, just put a remote controllably switch e.g. transistor switch board or, even simpler, just a microswitch mounted on a servo😉) in series with the Vcc (+ supply) to the timer chip. It takes longer for the first flash after switch on to occur as the cap has to charge up from 0V to 2/3 Vcc. After that only from 1/3 Vcc to 2/3. Ratio of ON time to OFF time depends on R1 and R2. ON=Cx(R1+R2), OFF=CxR2. Happy soldering and Flashing 😲, cheers, Doug 😎 PS: are your 555s bipolar or CMOS? Makes a difference! Bipolar types only drive the output to Vcc-1.7V. CMOS types drive the output to full Vcc😊 PPS: One other point! Is your 'Blue Lamp' a bulb or an LED? If an LED you will need a resistor in series with the output to limit the current to a max of about 30mA. Start with 1KOhm, if too dim go down to around 220/270Ohms.

none by lesliebreame Admiral   Posted: 10 months ago
Experimenting with steam flash boiler and it looks promising!!! Better make a pump next instead of the syringe but I don't expect the little oscillator will cope. If it doesn't will make a small electric one. Need an ice breaker today !!! Les

New to the game by Dave M Fleet Admiral!   Posted: 1 year ago
Hi Marky I have the Deans 4' glass fibre hull steam picket boat, uses either electric or a Miranda Twin oscillator steam plant. Mine is the gunboat version as against the Admirals barge, but all capital ships of the period have several picket boats so you have a wide choice. The bands on the funnel signified the boat number 2 bands, boat 2 etc. Good luck wth the builds Dave

Jane by lesliebreame Admiral   Posted: 1 year ago
One of my Old Trafford paddle steamers enhanced by my mate Duncan Laurimer and sailing on the put up pond at Tilford Rural Life Centre yesterday. Good fun was had by all !! The boiler is tablet fired [3 halves ] and is half filled with 65ml of water. Engine is single oscillator with 16:1 spur gearbox. Les Breame

"Sweet Sue" by Dave M Fleet Admiral!   Posted: 1 year ago
Hi Kevin Yes that's what I do. I am always amazed at the power the oscillator generates and once rotating very little steam is required to maintain speed. Then again it's not for windy or rough conditions. I would try gradually reducing the pressure until the engine show signs of stopping and then increase by a couple of psi to ensure safe running. You do not need to run the boiler at its max rated pressure when the escape valve will be opening just at a level that replaces what the engine uses. Can we have another video with the steam whistle sounding? Dave

"Sweet Sue" by Dave M Fleet Admiral!   Posted: 1 year ago
Looking good Kevin. I have a similar oscillator and it runs well on 20psi max and gives about half an hours steaming on a similar sized boiler. Dave

X System by mactin Commander   Posted: 2 years ago
Hi Edward, Its a fine balancing act of electrolysis to hydroide gas, compression then ignition but utillising vacuum formation as an assisting force to the power stroke so effectively making it a one stroke which sounds odd.still in development ive tried turbine,oscillator pistons and hydraulic recoil as end movers but the best seems to be the straight reciprocator. Its scary,how the hell can they tax water??? cheers Neil.

POLARITY by tomarack Commander   Posted: 2 years ago
Hi, I´m back . As I can see .. two-pole socket is designed for insertion of a crystal, ( quartz oscillator prism 35 MHz) not as a supply battery - this also may cause misunderstandings. This arrangement was customary for facilities of 80 and 90 years of the last century with interchangeable crystals. wishing success Tom

Naval pinnace or Picket boat completed by Dave M Fleet Admiral!   Posted: 2 years ago
Nice clean model. Clearly the No 1 boat for ceremonial and Captains use. I built the Deans version which is a 48" hull giving a scale of 1/12. I have sailed with electric power but not with my Miranda boiler and twin oscillator. I has steamed on my paddling pool at home but I am waiting for a calm day to sail on the club lake. Be good to see your model under srteam on the lake. Dave

Duke of Devonshire by hammer Fleet Admiral!   Posted: 4 years ago
My own design double acting twin oscillator. Running under steam for the first time. Steam pressure down to 5psi. By the bench on the floor a derelict fire boat, re build one day. Installed In Duke of Devonshire.

Victoria by Nickthesteam Lieutenant   Posted: 4 years ago
This Is Victoria, she was built from a Krick kit about 4 years ago, steam powered with a Maccsteam boiler and an SVS 10mm bore x 11mm stroke oscillator. She Is currently taking a well earned rest after 3 years hard work, out 3 days a week, weather permitting. Undergoing boiler cleaning, engine overhaul and a bit of patching up of the woodwork.

Victoria by Nickthesteam Lieutenant   Posted: 4 years ago
[Score: 8/10] 40"/3200g Victoria Capable of 3mph and a runtime of 35mins Single Propellor (3 Blade 70mm) Direct Drive to a SVS 10mm x 12mm (3 Blade) Controlled Through Maccsteam Boiler ESC - Comments: Victoria Is built from a Krick kit, and has a Maccsteam 3.5 Inch horizontal boiler fired by Propane/butane mix. The engine Is a 10mm bore x 12 mm stroke SVS oscillator. Radio Is Futaba 6EX 2.4 ghz.

engine room by hammer Fleet Admiral!   Posted: 5 years ago
Twin double acting oscillator, .75" bore .5" stroke, geared down 3 to 1. The boiler 2.5" diameter 6" long by two Interconnected. fire tubes 28mm reducing to 22mm half way, ten cross tubes 8mm In each. Silver gas regulators up front, two required to balance the jets, as only one gas cannister. The separator not connected yet. All my own design & manufacture. Except the pressure gauge & cannister tap.

Age of steam by CaptLarry Sub-Lieutenant   Posted: 5 years ago
Thanks for the advice, well received. This little engine (oscillator) Is soooooo simple, that any attempts to throttle It just causes It to stop. However, when up and running It propels the boat just fine. I think I'll just leave It as Is. The only boat clubs I have found here are only racing clubs, sail and speedboat. That's why I enjoy this site, you all are Interested In classic boating! Thanks again!