Realistic STA-225

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Realistic STA-225

Mondial
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Posts: 1,114
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Joined: Feb 2013
City: Irvington, NY

#16

12-25-2016, 11:49 AM

Ron, looking at the schematic, it appears that PL8 is part of the circuit. When a stereo signal is received, pin 6 of IC 30 is pulled to ground, lighting PL8. Transistor TR307 is an inverter, so when PL8 is on PL9 is off and vice-versa.

It looks like PL8 is the actual stereo light and PL9 is only on with a mono signal. The base drive for TR 307 is supplied through PL8 and if it is open, TR307 cannot turn on and light PL9.

Try connecting a 470 ohm resistor across the open bulb PL8 to supply base drive to TR307 and see if PL9 now lights in mono.

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Messages In This Thread

Realistic STA-225 - by Ron Ramirez - 12-23-2016, 10:09 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-23-2016, 10:14 PM

RE: Realistic STA-225 - by gregb - 12-23-2016, 10:17 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-23-2016, 11:24 PM

RE: Realistic STA-225 - by gregb - 12-23-2016, 11:42 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-24-2016, 12:11 AM

RE: Realistic STA-225 - by gregb - 12-24-2016, 01:25 AM

RE: Realistic STA-225 - by Ron Ramirez - 12-24-2016, 09:56 AM

RE: Realistic STA-225 - by gregb - 12-24-2016, 01:20 PM

RE: Realistic STA-225 - by gregb - 12-24-2016, 02:17 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-24-2016, 04:24 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-24-2016, 06:42 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-24-2016, 09:20 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-24-2016, 11:16 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-25-2016, 11:16 AM

RE: Realistic STA-225 - by Mondial - 12-25-2016, 11:49 AM

RE: Realistic STA-225 - by Ron Ramirez - 12-25-2016, 05:01 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-26-2016, 07:52 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-26-2016, 08:08 PM

RE: Realistic STA-225 - by Mondial - 12-27-2016, 12:28 AM

RE: Realistic STA-225 - by Ron Ramirez - 12-27-2016, 06:59 AM

RE: Realistic STA-225 - by Mondial - 12-27-2016, 10:35 AM

RE: Realistic STA-225 - by Ron Ramirez - 12-27-2016, 08:18 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-27-2016, 08:51 PM

RE: Realistic STA-225 - by Mondial - 12-27-2016, 09:56 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-27-2016, 10:55 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-28-2016, 09:22 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-28-2016, 10:36 PM

RE: Realistic STA-225 - by Mondial - 12-28-2016, 11:26 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-29-2016, 09:04 PM

RE: Realistic STA-225 - by Mondial - 12-29-2016, 10:39 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-29-2016, 11:39 PM

RE: Realistic STA-225 - by Mondial - 12-30-2016, 12:10 AM

RE: Realistic STA-225 - by Ron Ramirez - 12-30-2016, 07:36 PM

RE: Realistic STA-225 - by Ron Ramirez - 12-30-2016, 08:19 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-12-2017, 01:27 PM

RE: Realistic STA-225 - by Mondial - 01-12-2017, 06:20 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-12-2017, 07:02 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-13-2017, 10:20 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 12:50 AM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 11:13 AM

RE: Realistic STA-225 - by Mondial - 01-14-2017, 01:14 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 04:16 PM

RE: Realistic STA-225 - by morzh - 01-14-2017, 10:04 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 10:45 PM

RE: Realistic STA-225 - by morzh - 01-14-2017, 10:49 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 10:52 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 11:04 PM

RE: Realistic STA-225 - by KCMike - 01-14-2017, 11:12 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-14-2017, 11:22 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-15-2017, 12:06 AM

RE: Realistic STA-225 - by sam - 01-15-2017, 02:53 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-15-2017, 04:39 PM

RE: Realistic STA-225 - by Eliot Ness - 01-16-2017, 09:44 AM

RE: Realistic STA-225 - by Ron Ramirez - 01-16-2017, 10:29 AM

RE: Realistic STA-225 - by morzh - 01-16-2017, 10:12 AM

RE: Realistic STA-225 - by Eliot Ness - 01-16-2017, 10:29 AM

RE: Realistic STA-225 - by morzh - 01-16-2017, 10:59 AM

RE: Realistic STA-225 - by Ron Ramirez - 01-16-2017, 11:36 AM

RE: Realistic STA-225 - by morzh - 01-16-2017, 12:47 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-16-2017, 08:19 PM

RE: Realistic STA-225 - by morzh - 01-16-2017, 09:21 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-18-2017, 11:31 AM

RE: Realistic STA-225 - by Ron Ramirez - 01-18-2017, 10:49 PM

RE: Realistic STA-225 - by morzh - 01-18-2017, 11:10 PM

RE: Realistic STA-225 - by PhilcoMike - 01-19-2017, 03:34 PM

RE: Realistic STA-225 - by Ron Ramirez - 01-19-2017, 08:12 PM

RE: Realistic STA-225 - by Eliot Ness - 01-20-2017, 09:59 AM

RE: Realistic STA-225 - by Ron Ramirez - 01-20-2017, 10:18 AM

RE: Realistic STA-225 - by morzh - 01-20-2017, 01:04 PM

RE: Realistic STA-225 - by morzh - 01-20-2017, 01:00 PM

RE: Realistic STA-225 - by Ron Ramirez - 04-26-2020, 10:04 PM

RE: Realistic STA-225 - by morzh - 04-26-2020, 10:19 PM

RE: Realistic STA-225 - by Ron Ramirez - 04-28-2020, 02:39 PM

RE: Realistic STA-225 - by morzh - 04-28-2020, 03:04 PM

RE: Realistic STA-225 - by Stall-U-Rated - 04-29-2020, 12:31 AM

RE: Realistic STA-225 - by Ron Ramirez - 04-29-2020, 08:59 AM

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