From 6198dbf865fe8edf10a1f717d9c94908e119af84 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Ond=C5=99ej=20Hru=C5=A1ka?= Date: Sat, 16 Jun 2018 21:39:01 +0200 Subject: [PATCH] words.. --- README.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/README.md b/README.md index 4655295..fd5a82f 100644 --- a/README.md +++ b/README.md @@ -10,7 +10,7 @@ internal DAC and try it. The AD9833 is connected to SPI on pins PA4 (SS), PA5 (SCK), and PA7 (MOSI). Pins PA1 and PA2 are used by the ADC and attach before and after the filter (DUT). -The generator has a very low output amplitude (0.65 V max). To better utilize the +The generator has low output levels (0.65 V max). To better utilize the input range of the ADC, I used OP213 in a non-inverting configuration (resistors 7.5k and 2.2k), with a 10M resistor from the input to GND. This gives us gain of around 4.4, enough to reach just under 3V.