ZA-1202 Simple Function Generator -- Help!  - [Tentatively SOLVED] - - Page 1
Forum section: electronics / projects

author: Fugitive_Bill
author_rank: Newbie
timestamp: August 17, 2016, 06:50:40 pm
content: ZA-1202 Simple Function Generator -- Help!About 20 years ago I built the above Function Generator circuit, I think from a Dick Smith's Funway book or Discovery Project series at Tech.It uses a LM13700 Dual Operational Transconductance Amplifier.However I've lost the schematics and can't find many references to it by using google or where I could get the circuit diagram from to get it working again.Normally kept all that sort of data stored in my dirty great binder from the pre-online/internet days, but this one this not in there.I've tried Online Silicon Chip, Talking Electronics, EA, ETI archives and any thing else I can think of, but no joy.Anyone got any ideas where I'd find the schematic/diagrams?I'm basically after the pins in/outs to power it and to input into the DSO138.-B!LL!I've recently gotten a little bit back into tinkering with electronics and have been buying a bunch of little kits from BangGood - hence the wide shot that include a few a of them -I'm having great fun building then, learning all over again and learning new new things.

author: kripton2035
author_rank: Super Contributor
timestamp: August 17, 2016, 07:09:27 pm
content: seems to be a silicon chip article from february 1995 ?http://www.siliconchip.com.au/Static/EA%20Projectsat least it references za1202 and "function generator" terms...but it is not published online before 1998so it must be something you have as a paper somewhere ?

author: Unknown
author_rank: Unknown
timestamp: August 17, 2016, 09:26:37 pm
content: This one?http://www.vkham.com/resources/kits-manuals/dse-kit-information/download/8-dick-smith-kit-information/32-k-2802(edit: note that K-2802 is the DSE kit number, but it's the EA/SC ZA-1202 design & board.)

author: Fugitive_Bill
author_rank: Newbie
timestamp: August 18, 2016, 06:59:57 pm
content: Guys,Thanks for the prompt replies however I have previously tried them, they do in fact list the projects but do not link to anything,such as the circuit diagrams/schematics, so basically they they are of no use.Seems all the listings only provide the list of projects that the magazines featured at the the time of publication.I've found quite a few other listing where they do show the article - or part there of - from the magazine,but only a few of them include projects that I actually have in my old parts/junk/boxes/draws.I might/could/should have closer look at the ZA-1202 project PCB layout and components and try to figure it out what the wires are supposed to be connect to,but I'd prefer to get proper details, so that I can avoid blowing the thing up with the magic smoke.It's not overly important, I just thought I'd have a bit of fun bringing it back to life !!-B!LL!

author: kripton2035
author_rank: Super Contributor
timestamp: August 18, 2016, 07:54:25 pm
content: this k2802 seems althought a really good catch ?

author: StillTrying
author_rank: Super Contributor
timestamp: August 18, 2016, 09:16:38 pm
content: I don't know how close this is.http://www.radiomanual.info/schemi/ACC_instrument/Dick_Smith_K-2802_user.pdf

author: Unknown
author_rank: Unknown
timestamp: August 18, 2016, 11:16:27 pm
content: Quote from: Fugitive_Bill on August 18, 2016, 06:59:57 pmInteresting - the link I gave worked, but seems to have been made registration-only since I posted it.StillTrying's link is the exact same DSE kit construction manual I linked, with component overlay (including off-board parts/connections), parts list, & schematic.

author: Fugitive_Bill
author_rank: Newbie
timestamp: August 20, 2016, 07:55:26 pm
content: Excellent, thanks guys, that appears to be the exact same Function Generator.I'll let you know if I get it working and even post a video of sweeps on the DSO138 scope if I get time unless I get too lazy.Got lots of other projects gong on at the moment taking up all my time - I really think there are not enough hours in a day.I think someone should increase it to at least 36 hours !!In any case thanks for the help, after all the searching I did, I was not expecting any one to be be able to help.-B!LL!