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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 5:20 am 
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ok, here goes the "stupid question" of the thread.

I will let the old year go out with a bang.

I have a few of those little metal box type radio shack, micronta, pyramid, etc. power supplies laying around here. some are 12 volt and some are 13.8 volts. i have used both during a RARE instance of powering up and/or bench testing a CB or car radio back in the day.

there is a 2 volt difference between the 12 and 13.8 vdc models so my question is, which should i use to permanently power this radio when i build the jig to display/use the radio ?

to help out with my dignity :oops: , am asking for this reason: which would be better for the radio / best performance / as in, not hurt the radio ; 12v or 13.8 v?

i just don't want to hose up the radio. it was such a lucky find and my dad is so happy with it.

i say 13.8v, but i would like to hear from anyone who has more experience than me on this topic, which is probably everyone who replied to this thread.

...unchartered territory here folks and i don't want to mess it up...

steve

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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 5:28 am 
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Steve,

A fully charged vehicle lead acid battery is at about 12.6 to 12.65 volts at rest.

A properly working alternator will impress 13.8 to 14.2 volts across the battery terminals [ideally ] during normal charging.

The radio was designed for over 13 volts in mind. Even with inherent voltage drops in the factory wiring, you will want the higher voltage. The caps inside the radio for the power filtering are rated for at least 16 volts D.C.

You won't "hose" the radio at 13.8 volts or even 14. If something fails, it was going to anyway.

The only thing to verify is what the voltage is under load. If it is a poor power supply, (regulation wise), that simple am radio won't draw much and you don't want it actually putting 15 volts across it for example.


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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 5:32 am 
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thanks.

i will check the voltages with the radio operating when i get to working on it this winter/spring.

i figured that 14v would be fine.

thanks again.

steve

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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 2:11 pm 
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Those little power supplies should work just fine. Typical car voltage is around 13.8 volts, and an alternator can supply 15 or even 16 volts. As far as power, that original radio offered a whopping 3 watts into an 8 ohm speaker. That's now a lot of current draw. A 2 amp power supply is adequate.

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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 3:57 pm 
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I have a Micronta 22-124A 'Regulated' 13.8v supply on the bench to power most car radios and accessories. It is old-fashioned, but quiet on AM.
For AM radios you don't a switching or switch-mode power supply that can make RFI noise on the band, especially when fishing around for low-power, distant stations.
https://ham.stackexchange.com/questions ... c-adapters


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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 5:24 pm 
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hi gary: thanks for that information, it is exactly what i wanted to know.

hi wally: yes, i certainly did not want one of those switching power supply "bricks". a good old fashioned Micronta shall work fine.

anyone have one of those 22-142 Microntas for cheap ?

thanks.

steve

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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sat 30, 2017 10:02 pm 
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How close are you to Mechanicsburg?
https://www.ebay.com/p/Micronta-22-124a ... /729769670


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 Post subject: Re: Late 1970's Dodge Radio Questions
PostPosted: Dec Sun 31, 2017 6:49 am 
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about 2 hrs.

steve

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 Post subject: Re: 1978 Dodge 3501640 Radio Questions Spkr Impedance ?
PostPosted: Jan Fri 19, 2018 5:45 am 
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I was able to decipher the model number on the sticker.

it is:

3501640 and the number under it that says "serial" is 07902

I was able to find this old ebay listing on the internet.

https://www.ebay.com/p/Vintage-1960s-70 ... uctDetails

this old auction lists my numbers of 3501640 and 07902 just as they are on my radio's sticker.

can anyone find the specs and/or schematic to allow me to know if it uses a 4 or 8 ohm speaker ?

mine has no fader as it has only 1 set of speaker leads.

steve

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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Fri 19, 2018 7:35 am 
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It's in AR 181. Don't have that one.

billn


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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Fri 19, 2018 12:19 pm 
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Speaker impedance for 3501640 is not given on the factory schematic.
image: https://i.ebayimg.com/images/g/pRsAAOSw ... -l1600.jpg
https://www.ebay.com/sch/i.html?_from=R ... 5&_sacat=0

As Wally stated earlier, negative return is through the common vehicle ground/bodywork.

Greg.

https://www.samswebsite.com/en/photofac ... h&s=Search


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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sat 20, 2018 7:07 pm 
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For what it’s worth, the Sams index listing for 3501640 indicates “similar to page 35 of AR-181”. The 1974 Dodge/Chrysler radio there has a fader for front and rear speakers, which are listed as 3.2Ω each.

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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 4:58 am 
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hi folks,

here is what we have so far in acquiring the schematic and/or finding out the impedance of the original speaker:

Model: 3401640
Another Number: 07902
Printed Circuit Board: 3598491 ; US 01382
Sticker By Volume Control: TRW: Canada ; 830618 ; Chrysler 3597436
Howard Sams Schematic: AR-181
Output Chip: 8445 ; 8775
No Fader, Single Speaker Model Only

thanks,

steve


Attachments:
Dodge 1978 Radio (1).JPG
Dodge 1978 Radio (1).JPG [ 96.73 KiB | Viewed 343 times ]
Dodge 1978 Radio (6).JPG
Dodge 1978 Radio (6).JPG [ 121.36 KiB | Viewed 343 times ]
Dodge 1978 Radio (7).JPG
Dodge 1978 Radio (7).JPG [ 140.15 KiB | Viewed 343 times ]
Dodge 1978 Radio (8).JPG
Dodge 1978 Radio (8).JPG [ 121.19 KiB | Viewed 343 times ]
Dodge 1978 Radio (9).JPG
Dodge 1978 Radio (9).JPG [ 138.17 KiB | Viewed 343 times ]
Dodge 1978 Radio (15).JPG
Dodge 1978 Radio (15).JPG [ 106.38 KiB | Viewed 343 times ]

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Last edited by Dutch Rabbit on Jan Sun 21, 2018 3:27 pm, edited 1 time in total.
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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 5:00 am 
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can anyone identify the 'real' number of this chip ? a search of both numbers has come up with nothing.

sorry (for perhaps) and elementary question, but I have very little experience with SS items like this.

8445
8775

5 pin TO-220

thanks.

steve


Attachments:
Dodge 1978 Radio (3).JPG
Dodge 1978 Radio (3).JPG [ 133.8 KiB | Viewed 343 times ]

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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 5:08 am 
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excellent. thanks for that.

steve

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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 1:48 pm 
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The audio output IC (U1) is a proprietary (captive) part with a Chrysler (Mopar) part # 3598445. It is the same 2 watt IC shown in the Sams parts list for the 4048362 radio. The number underneath the part # is a vendor/date code.
The 3598520 4 watt IC would be used in radio applications with a fader (2 speakers).
As far as a generic equivalent, an NTE/ECG 5-pin SIP audio amplifier similar to an NTE1232 has the same pinout as the Chrysler IC:
http://www.nteinc.com/specs/1200to1299/pdf/nte1232.pdf


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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 3:11 pm 
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hi wally,

the data sheet for the NTE says "loads down to 1.6 ohms".

so, with MAG's reply above and your NTE data sheet, i bet the speaker could have been 4 ohms.

interesting...

thanks very much.

steve

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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 3:17 pm 
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hi wally, how did you know the cross reference to NTE ?

thanks.

steve

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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 4:14 pm 
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Hi Steve,

The NTE chip is a replacement for the TDA2002 or the improved TDA2003 amplifier ICs.
Do check if the circuit in your radio matches the suggested application circuits in the TDA datasheets.


Regards, Peter


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 Post subject: Re: 1978 Dodge Radio Schematic Spkr Impedance Needed, Questi
PostPosted: Jan Sun 21, 2018 6:43 pm 
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The NTE example that I used may have different specs than the Chrysler chip. I just picked the NTE1232 because of the similar pinout, configuration and that it is used in automotive applications.
It suggests an 8 watt output which the Chrysler radio circuit may or may not support.
I have a 1988 NTE catalog that I just used to find a 5-pin AF amplifier IC in a TO-220 case with a similar non-inverted/inverted input, 12 volt Vcc/ground and single output pin.
I doubt that we could find published specs for the 3598445 IC other than its rated output.


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