updated docs for pull up open drain

IBT-FMI · Apr 29, 2018 · 76db2a9 · 76db2a9
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diff --git a/documentation/COSplay.rst b/documentation/COSplay.rst
@@ -12,7 +12,8 @@ Features
 ========
 
 - TTL trigger from MRI scanner can be used
-- 3 TTL output channels (3.3V) and 3 transistor channels
+- 2 TTL output channels (~4.2V)
+- 2 transistor channels (up to ~3.3V)
 - 2 TTL output channels with variable amplitude
 - Microcontroller can be used standalone (c.f. :ref:`pyboard`)
 - Stimulus pulse delivery with  :math:`ms` or :math:`\mu s` accurary

diff --git a/documentation/circuit.png b/documentation/circuit.png
diff --git a/documentation/pyboard.rst b/documentation/pyboard.rst
@@ -78,7 +78,8 @@ You can use a programme like 'screen', 'minicom' or 'picocom' to debug syntax er
 Circuit
 =======
 
-The following figure shows the circuit used with the pyboard. BNC 1-3 can short circuit the incoming BNC. Ports 4-6 can deliver 3.3V TTL pulses. Port 5 and 6 further more allow changing the amplitude of the TTL pusle.
+The following figure shows the circuit used with the pyboard. BNC 1 and 2 can short circuit the incoming BNC. Ports 3 and 4 can deliver ~4.2V TTL pulses. Port 5 and 6 allow changing the amplitude of a TTL pusle (max. ~3.3V).
+Exact output values depend on the input voltage of the USB port. 
 
 .. image:: circuit.png