Magnetic Audio Tape Recording - Electronic Circuits Projects Diagrams Free

dimper129 · 30th August 2007, 08:08 AM

I need a simple circuit for audio magnetic tape recording.
I make some simple amplifire circuit and attach the the recording head wiht it
but it dosent work.

**Nigel Goodwin** · 30th August 2007, 09:29 AM

You need to provide a high level AC bias, plus a 'constant' current recording current - there are plenty of circuits about to show you how, try google.

dimper129 · 30th August 2007, 09:05 PM

sorry i dont find any help on google.

ronsimpson · 30th August 2007, 09:17 PM

Pre WWII they just applied audio to the heads and the sound was bad.
Post WWII they add 30-150khz tone to the audio then to the heads. (The frequency depends on tape speed and width.)

>Wikipedia----Tape Bias<

dimper129 · 30th August 2007, 09:53 PM

for what purpos the tone is added to the audio.
If you have a simple circuit please send me.

**Nigel Goodwin** · 30th August 2007, 09:55 PM

Quote:

Originally Posted by ronsimpson

Pre WWII they just applied audio to the heads and the sound was bad.
Post WWII they add 30-150khz tone to the audio then to the heads. (The frequency depends on tape speed and width.)

I don't know about that kind of date, I'm pretty sure AC bias was used pre-WWII? - the Germans were even developing helical scanning - because after the war the Americans 'stole' the technology and Ampex (with backing from Bing Crosby!) developed high quality tape machines, which led to VCR's!.

ronsimpson · 30th August 2007, 10:05 PM

Nigel You are good.
Only the Germans were using AC bias pre-WWII. The Americans stole that. The Russians and Americans stole the Rocket Engineers and the race was on!

Dimper129: go to Wikipedia and lookup Tape Bias!

Dean Huster · 1st September 2007, 03:09 AM

The Soviets and Americans may have "stolen" a few select scientists (many of them were stolen from the Soviets who had spirited them away and vice versa), but most were more than happy to "get out of Dodge" as long as they could take their families. Germany, especially Berlin, was pretty well shredded during the end of WWII and life there wasn't very desirable.

Dean

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
Magnets and Electromagnets	ElectroMaster	Electronic Theory	11	27th November 2007 03:31 PM
Non-stop Digital Audio Recorder	denisky	Electronic Projects Design/Ideas/Reviews	4	18th October 2006 12:50 AM
Magnetic Acoustic Audio Pickup schematic wanted	gjpollitt	General Electronics Chat	5	1st July 2004 01:09 PM
recording audio with PIC 16C745	dario_alvarez	Micro Controllers	1	18th February 2004 09:01 PM
Recording audio of a telepone wire	MarioAllStar	Electronic Projects Design/Ideas/Reviews	9	16th February 2004 09:35 PM

30th August 2007, 08:08 AM	(permalink)
dimper129	Magnetic Audio Tape Recording I need a simple circuit for audio magnetic tape recording. I make some simple amplifire circuit and attach the the recording head wiht it but it dosent work.

30th August 2007, 09:29 AM	(permalink)
Nigel Goodwin	You need to provide a high level AC bias, plus a 'constant' current recording current - there are plenty of circuits about to show you how, try google. __________________ PIC programmer software, and PIC Tutorials at: http://www.winpicprog.co.uk

30th August 2007, 09:05 PM	(permalink)
dimper129	sorry i dont find any help on google.

30th August 2007, 09:17 PM	(permalink)
ronsimpson	Pre WWII they just applied audio to the heads and the sound was bad. Post WWII they add 30-150khz tone to the audio then to the heads. (The frequency depends on tape speed and width.) >Wikipedia----Tape Bias<

30th August 2007, 09:53 PM	(permalink)
dimper129	for what purpos the tone is added to the audio. If you have a simple circuit please send me.

30th August 2007, 10:05 PM	(permalink)
ronsimpson	Nigel You are good. Only the Germans were using AC bias pre-WWII. The Americans stole that. The Russians and Americans stole the Rocket Engineers and the race was on! Dimper129: go to Wikipedia and lookup Tape Bias!

1st September 2007, 03:09 AM	(permalink)
Dean Huster	The Soviets and Americans may have "stolen" a few select scientists (many of them were stolen from the Soviets who had spirited them away and vice versa), but most were more than happy to "get out of Dodge" as long as they could take their families. Germany, especially Berlin, was pretty well shredded during the end of WWII and life there wasn't very desirable. Dean __________________ Dean Huster, Electronics Curmudgeon Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines). R.I.P.