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tashtari's latest activity
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
I wrote some firmware this morning for the 1704, it uses a fixed-length loop that gets the clock in the ballpark (359.2 kHz, says the...
Yesterday at 3:27 PM
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Status update. So, a few iterations later, I have some firmware for the PIC12F1501 that's about as densely packed as I can get it...
Monday at 4:48 PM
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Just a tiny bit more... the spec sheet for the PIC12F1501 says typical supply current is 1.09 mA, max is 1.7 mA.
Friday at 12:06 PM
tashtari
replied to the thread
Transformers for homemade LocalTalk/PhoneNet dongles
.
Put up some two-packs of these for sale for $7, BYO pigtail:
Friday at 12:51 AM
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
A little more story... I went hunting for trouble and asked in ##electronics on Libera about how I could improve the shape of the...
Thursday at 11:52 AM
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Aha! Switched out the 3.3 KΩ resistor with a 470 Ω resistor and the waveform actually dips below zero for a reasonable time now. The...
Apr 17, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Tried building and running this circuit with a test PIC (not the 12F1501 yet) and it doesn't seem to be having quite the desired effect...
Apr 17, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Hmm... so would this work? Here, RA2 on the PIC is generating the clock signal, and RA5/RA4 are outputting opposite signals (so a true...
Apr 17, 2024
tashtari
replied to the thread
Transformers for homemade LocalTalk/PhoneNet dongles
.
The important bit of the patent appears to be: The transformer I'm using has a max interwinding capacitance of 20 pF, and a max DC...
Apr 17, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
If we're taking power off TxD+ and TxD- like the real MacRecorder does, we have a positive and negative some-number-of-volts rail (on my...
Apr 17, 2024
tashtari
replied to the thread
Transformers for homemade LocalTalk/PhoneNet dongles
.
Boards are here and working! I've got some IDC connectors coming in for the DE-9 version. The pigtail pictured is one I just had...
Apr 16, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Two serial ports - SoundEdit has been designed with this capability in mind in case you bought two MacRecorders. From a technical...
Apr 16, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
Got my MacRecorder! Its protocol is really pretty simple, I was just being thrown for a loop by the fact that my SE wasn't playing nice...
Apr 16, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
There's this one: I'm not sure how well I understand where V+ and V- are coming from... but I'm finding this approach potentially...
Apr 15, 2024
tashtari
replied to the thread
Cloning the Farallon MacRecorder
.
I feel like we're straying from the topic a bit here, and I'm afraid I'm confusing the issue by talking about RS-232/422/423/485. To...
Apr 15, 2024
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