Posts by manfy
183 total posts183 results
Beogram 4500 servo motor
in Imported Content (Unmapped) · Feb 8, 2022 20:00[quote user="JimT"] With the unit plugged the measurements are 31.4Ω and 30.4Ω and solid. [/quote] 😕 Forget these values, they're bogus. You cannot measure resistance in a live circuit. The multimeter uses its own curre…
Beogram 4500 servo motor
in Imported Content (Unmapped) · Feb 8, 2022 06:57[quote user="JimT"] But really is goes all over the place depending how fast or slow i rotate...[/quote] 🙂 Yes, that's normal. When you spin the rotor manually, the motor turns into a generator and the generated voltage…
Beogram 4500 servo motor
in Imported Content (Unmapped) · Feb 6, 2022 10:41[quote user="JimT"] I now get to P1-1 to P1-2 +2.3V and -7.3V when i operate the < and > buttons. I also get 8.64V from pin2 of IC2 to ground. As for the motor... i measure 60.7 Ω across the terminals and 25mA at 6.5V (w…
missing BG4000
in Imported Content (Unmapped) · Feb 4, 2022 19:08[quote user="Craig"] ....I will order this BA06CC0FP-E2 Rohm, Fixed LDO Voltage Regulator, 4V to 25V, 300mV Dropout | Farnell and mount it on a board and wire onto the PCB2.... [/quote] 🤒 Don't forget to order the stabi…
missing BG4000
in Imported Content (Unmapped) · Feb 4, 2022 16:55🤒 Excellent! That settles it! Those values make sense and we can assume an average current of 0.75A at the 24V coil during normal opetration and 0.25A at the 9Vrms winding (or 12V in case of the 2x12V replacement trafo)…
missing BG4000
in Imported Content (Unmapped) · Feb 4, 2022 11:31[quote user="Craig"] .....I tried several times and couldnt get a MAX reading greater than 0.730A......looking at the solenoid operation it is very quick to operate the switch that drops the initial current down to the h…
missing BG4000
in Imported Content (Unmapped) · Feb 2, 2022 11:48[quote user="Craig"] Manfy How does this stack up for the voltage regulator?..... L7806CV Stmicroelectronics, Linear Voltage Regulator, 7806, Fixed | Farnell [/quote] Hmm...that's just a standard run-of the-mill voltage …
missing BG4000
in Imported Content (Unmapped) · Feb 1, 2022 12:30[quote user="Craig"] The secondary AC output voltage to the bridge rectifier 2D5 under no load was almost 9.5 vac for the 6.0 vdc supply.....will 2X12 vac outputs be good for these requirements?......I dont see an issue …
missing BG4000
in Imported Content (Unmapped) · Feb 1, 2022 10:47[quote user="Craig"] I don't want to retain the multiple input voltage selection...just the switch, removing the switch and fuse box leaves a hole in the bottom that will require blanking off somehow.......not a massive …
missing BG4000
in Imported Content (Unmapped) · Jan 31, 2022 21:12Oops, sorry! That was the 50VA version. They also carry the 30VA transformer with 2x115V primaies: https://uk.farnell.com/vigortronix/vtx-146-030-212/30va-toroidal-transformer-2x12v/dp/2817644 And it's available ex stock…
missing BG4000
in Imported Content (Unmapped) · Jan 31, 2022 19:28Yes, that looks promising -- especially now that sonavor has confirmed that a transformer with a nominal power rating of 120 x 0.34 = 40.8VA is working just fine. Don't worry too much about the nominal rating of 1.25A be…
missing BG4000
in Imported Content (Unmapped) · Jan 31, 2022 16:09[quote user="sonavor"] The resulting toroid was 71.1 mm in diameter and 35.5 mm in height. A couple things to note about the design for mine are that I opted for a US-only voltage so I don't have the voltage selection fo…
missing BG4000
in Imported Content (Unmapped) · Jan 31, 2022 14:22Thanks! ...but in this case I would have preferred actual dimensions in mm... Oh well, as an optimist I gather that following plot of Beogram land (in light red) is available for redevelopment?😎 I reckon that's good 10x…
missing BG4000
in Imported Content (Unmapped) · Jan 31, 2022 10:32[quote user="Craig"] [...] In my view leaving this unfinished isn't an option.... [/quote] 🙂 🤒 Good decision! And even if a custom-made transformer is beyond reach, all may not be lost just yet! I did look at the desig…
missing BG4000
in Imported Content (Unmapped) · Jan 30, 2022 16:57[quote user="Craig"] Well......got around to it this afternoon, disconnected the remaining two secondary windings and powered up the unit 56mA.............I think we have our culprit, the question is can anything be done…
missing BG4000
in Imported Content (Unmapped) · Jan 29, 2022 14:18Hi Craig, thanks! Yes, 71mA (or 18W) is definitely too high for standby. The 25mA or 6W look reasonable for a product from the seventies. But without seeing the idle current on the primary winding when all loads on the s…
missing BG4000
in Imported Content (Unmapped) · Jan 28, 2022 19:26[quote user="Craig"] [...].if i disconnect the top 44.5 ohm winding from the circuit (this is not now in use for the neon lamp) will this adversely affect the remaining windings which will still be subject to 230vac with…
Beomaster 6000 and datalink protocol
in Imported Content (Unmapped) · Jan 26, 2022 16:58👍 Thanks! That makes things easier.
Beogram 4500 servo motor
in Imported Content (Unmapped) · Jan 26, 2022 16:51One more thought: Before you test the circuit with the new Zener diode, you should probably disconnect the motor to avoid any unwanted damage. Just measure the voltage at the OpAmp output from P1-1 to P1-2. You should al…
Beogram 4500 servo motor
in Imported Content (Unmapped) · Jan 23, 2022 10:29If you're ordering that part, you may want to look at the next bigger diode! At 500mW the Zener can provide a max. of 170mA and that seems a bit low for a motor and an opamp that is spec'd at 700mA output current! I'd pr…